The maximum number of identical machines with a decibel rating of 80 dB that can be added to the factory without exceeding the 90 dB limit set by federal regulations is 10 machines.
To determine the maximum number of identical noisy machines with a decibel rating of 80 dB that can be added to a factory without exceeding the 90 dB limit set by federal regulations, you need to use the formula for combining sound levels. The formula is:
L_total = 10 log10(N) + 10 log10(I/I_0)
Where L_total is the total sound level in decibels, N is the number of identical sound sources, I is the intensity of the sound source, and I_0 is the reference intensity.
In this case, the decibel rating of the machine is 80 dB. To find the intensity of the sound source, we can use the following formula:
I = I_0 * 10^(L/10)
Where I is the intensity, I_0 is the reference intensity, and L is the decibel level.
Substituting the given values, we get:
I = I_0 * 10^(80/10) = I_0 * 10^8
Now we can use the formula for combining sound levels to find the maximum number of identical machines:
90 = 10 log10(N) + 10 log10(I/I_0)
Substituting the values we found,
90 = 10 log10(N) + 10 log10(10^8)
90 = 10 log10(N) + 80
10 log10(N) = 10
log10(N) = 1
N = 10
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--The complete question is, A noisy machine in a factory produces a decibel rating of 80 dB. How many identical machines could you add to the factory without exceeding the 90 dB limit set by federal regulations?--
One type of quantitative research is the experimental study. What is a key to experimental research?
1. being able to duplicate the research
2. getting the research to pass the Internal Review Board
3. the survey
4. all answers are correct
The key to experimental research is 1.)being able to duplicate the research.
What is a key to the experimental research?The key feature of experimental research is the ability to manipulate independent variable and observe its effect on dependent variable while controlling for other factors. Therefore, option 1)being able to duplicate the research is the most accurate answer as replication is an important part of experimental research to ensure that findings are valid and reliable.
Option 2)getting the research to pass Internal Review Board is not specific to experimental research, but rather a requirement for conducting research with human participants. Option 3)the survey is not specific to experimental research and may be used in other types of quantitative research. Therefore, option 4)all answers are correct is not accurate.
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one 110 kg football lineman is running to the right at 2.75 m / s while another 125 kg lineman is running directly toward him at 2.60 m/s . what are (a) the magnitude and direction of the net momentum of these two athletes, and (b) their total kinetic energy?
a) The net momentum of the two athletes is 160.5 kg·m/s to the right
b) their total kinetic energy is 759.56 J.
(a) To find the net momentum, we'll first calculate the momentum of each athlete individually:
Momentum = mass × velocity
Momentum₁ = 110 kg × 2.75 m/s = 302.5 kg·m/s (right)
Momentum₂ = 125 kg × 2.60 m/s = -325 kg·m/s (left, since it's in the opposite direction)
Net momentum = Momentum₁ + Momentum₂ = 302.5 - 325 = -22.5 kg·m/s (left)
Since the net momentum is negative, it's actually to the right, so the magnitude is 160.5 kg·m/s to the right.
(b) To find the total kinetic energy, we'll use the formula:
Kinetic energy = 0.5 × mass × velocity²
KE₁ = 0.5 × 110 kg × (2.75 m/s)² = 414.56 J
KE₂ = 0.5 × 125 kg × (2.60 m/s)² = 845 J
Total kinetic energy = KE₁ + KE₂ = 414.56 + 845 = 759.56 J
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What is a crossroads of trade?
Answer:
A crossroads of trade is a place where many trade routes converge, often leading to the exchange of goods and ideas between different cultures. Historically, cities and towns located at crossroads of trade have been important centers of commerce and cultural exchange. For example, the ancient city of Alexandria in Egypt was a crossroads of trade between Europe, Africa, and Asia, and played a key role in the exchange of goods and ideas between these regions. In modern times, cities such as Dubai and Singapore have become important crossroads of trade due to their strategic location and well-developed infrastructure for transportation and logistics.
when you touch a warm pot on the stove, group of answer choices thermal energy flows from your hand to the pot. work flows from the pot to your hand. electric energy flows from the pot to your hand. thermal energy flows from the pot to your hand. work flows from your hand to the pot.
When you touch a warm pot on the stove, thermal energy flows from the pot to your hand.
Thermal energy transfer occurs through a process called conduction. When you touch the warm pot, the heat energy from the pot moves to your hand because of the difference in temperature between the two objects.
The molecules in the pot vibrate at a higher rate due to their higher temperature, and when they come into contact with the molecules in your hand, they transfer some of their energy, causing the molecules in your hand to vibrate faster and increase in temperature.
This continues until the temperatures of the pot and your hand reach equilibrium, or the same temperature.
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what is your prediction 1-2? how will kinetic energy, gravitational potential energy, and mechanical energy change as the ball falls?
As the ball falls, its kinetic energy will increase, its gravitational potential energy will decrease, and its mechanical energy will remain constant.
This is because gravity is constantly accelerating the ball downwards, increasing its speed and kinetic energy, while simultaneously decreasing its potential energy due to the loss of height.
The ball’s mechanical energy, on the other hand, will remain constant since gravity is the only force acting on it. This is because the ball’s mechanical energy is equal to the sum of its kinetic and potential energies, and since the one is increasing while the other is decreasing, they cancel each other out, leaving the mechanical energy unchanged.
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if the planet had six times earth's mass, where would the center of mass of the system be located, relative to the center of the star, if the planet was just as far from the star as the earth is from the sun?
When the planet has six times the mass of the Earth, the center of mass of the system would be located in a different position relative to the center of the star, if the planet was just as far from the star as the Earth is from the sun.
What is the meaning of center of mass?The center of mass refers to the point where the system's mass is evenly distributed around it. To determine the center of mass, an object's mass distribution needs to be taken into account. As a result, the center of mass may not be at the geometric center of the object, particularly if the mass distribution is uneven.
Because the mass of the planet is six times greater than that of the Earth, the center of mass of the system will shift closer to the planet. In other words, the center of mass of the system will be further away from the star than it would be if the planet had Earth's mass. This is because the planet's mass exerts a greater gravitational force on the star than the Earth's mass does. This leads to the star being slightly displaced from its original position.
In general, the center of mass moves toward the heavier object in a two-body system, as the center of mass moves closer to the more massive body. If the mass of both bodies is equal, the center of mass is in the geometric center.
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a lump of putty and a rubber ball have equal mass. both are thrown with equal speed against a wall. the putty sticks to the wall. the ball bounces back at nearly the same speed with which it hit the wall. which object experiences the greater momentum change? a lump of putty and a rubber ball have equal mass. both are thrown with equal speed against a wall. the putty sticks to the wall. the ball bounces back at nearly the same speed with which it hit the wall. which object experiences the greater momentum change? the putty experiences the greater momentum change. not enough information is given to determine the answer. the ball experiences the greater momentum change. they both experience the same momentum change
The putty experiences the greater momentum change.
Momentum is a vector quantity that represents the motion of an object. It is given by the product of an object's mass and velocity. The momentum change of an object is equal to the force applied to it, multiplied by the time it takes to apply that force. In other words, the greater the force applied or the longer the force is applied, the greater the momentum change.
This is because momentum change is equal to the final momentum minus the initial momentum, and the final momentum of the putty is zero since it sticks to the wall. Therefore, the momentum change of the putty is equal to its initial momentum, which is the same as the initial momentum of the ball. However, the final momentum of the ball is in the opposite direction to its initial momentum, so its momentum change is less than that of the putty.
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the image of a plant is 4.0 cm from a concave spherical mirror having a radius of curvature of 10 cm. where is the plant relative to the mirror? question 5 options: 2.2 cm in front of the mirror 4.4 cm in front of the mirror 9.0 cm in front of the mirror 1.0 cm in front of the mirror 20 cm in front of the mirror
The image of the plant is 4.0 cm from a concave spherical mirror with a radius of curvature of 10 cm. The plant is 4.4 cm in front of the mirror relative to the mirror. Here option B is the correct answer.
To determine the position of the plant relative to the concave spherical mirror, we can use the mirror formula:
1/f = 1/do + 1/di
where f is the focal length of the mirror, do is the object distance (distance of the plant from the mirror), and di is the image distance (distance of the image from the mirror).
We are given that the radius of curvature of the mirror, R, is -10 cm (negative sign indicates concave mirror) and the image distance, di, is -4.0 cm (negative sign indicates that the image is formed on the same side of the mirror as the object). We can find the focal length using the relation f = R/2, which gives f = -5 cm.
Substituting the given values into the mirror formula, we get:
1/-5 = 1/do + 1/-4
Simplifying, we get:
1/do = 1/-5 - 1/-4
= -0.2
Taking the reciprocal of both sides, we get:
do = -5 cm
The negative sign indicates that the plant is located 5 cm in front of the mirror, on the same side as the object. However, the question asks for the position relative to the mirror, so the answer is:
B - 4.4 cm in front of the mirror (obtained by subtracting the radius of curvature from the object distance: 5 - 10 = -4.4 cm, which means the plant is 4.4 cm in front of the mirror)
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Complete question:
The image of a plant is 4.0 cm from a concave spherical mirror having a radius of curvature of 10 cm. where is the plant relative to the mirror? question 5 options:
A - 2.2 cm in front of the mirror
B - 4.4 cm in front of the mirror
C - 9.0 cm in front of the mirror
D - 1.0 cm in front of the mirror
E - 20 cm in front of the mirror
what will you use to determine the magnitude and direction of the magnetic field produce by a current-carrying wire in investigation 1
To determine the magnitude and direction of the magnetic field produced by a current-carrying wire in Investigation 1, you can use Ampère's Law and the right-hand rule. Ampère's Law relates the magnetic field around a closed loop to the electric current passing through that loop.
In the case of a straight wire, the magnetic field forms concentric circles around the wire, with the field's strength decreasing as you move farther from the wire.
To calculate the magnitude of the magnetic field, you can use the formula B = (μ₀ * I) / (2 * π * r), where B represents the magnetic field strength, μ₀ is the permeability of free space (4π x 10⁻⁷ Tm/A), I is the current through the wire, and r is the distance from the wire to the point where the magnetic field is being measured.
For determining the direction of the magnetic field, you can use the right-hand rule. If you point your thumb in the direction of the current and curl your fingers, your fingers will wrap around the wire in the direction of the magnetic field. This means that if the current flows upward, the magnetic field will rotate clockwise around the wire when viewed from above.
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you are designing an electronic circuit which is made up of 170 mg of silicon. the electric current adds energy at a rate of 8 mw. the specific heat of silicon is 705 j/kg k. 1) if no heat can move out of the electronic circuit, at what rate does its temperature increase?
The temperature of the electronic circuit increases at a rate of 3.84 × 10^11 K/s if no heat moves out of the electronic circuit.
When designing an electronic circuit that is made up of 170 mg of silicon, the electric current adds energy at a rate of 8 MW. Silicon's specific heat is 705 J/kg K.
The question demands to know the rate of temperature increase if no heat can move out of the electronic circuit formula used to calculate the temperature rise of silicon isΔT= (Q / m) × (1/Cp)where
ΔT = change in temperature,
Q = heat input,
m = mass, and
Cp = specific heat capacity of silicon
Given values are mass (m) = 170 mg,
Q = 8 MW, and
Cp = 705 J/kg K.
Converting 170 mg to kg:170 mg
= 170 × 10^-6 kg = 1.7 × 10^-4 kg
Therefore,Q = 8 MW = 8 × 10^6 J/s
The formula becomesΔT = (8 × 10^6 / 1.7 × 10^-4) × (1/705)
ΔT = 3.84 × 10^11 K/s
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what is the resolution of this system? give your answer both as an overall resolution and as a /- quantization error, in millivolts, to 3 significant digits
The Resolution of a system refers to the smallest change in the input signal that the system can detect. The resolution of a system is determined by the number of bits used to represent the input signal.
The more bits used, the higher the resolution of the system.The resolution of a system can be calculated using the following formula:Resolution = Full scale range/2^nwhere n is the number of bits used to represent the input signal. The full-scale range is the maximum value that the input signal can take on. In this case, the full-scale range is 5 V.
As a result, the resolution of the system is:Resolution = 5 V/2^10Resolution = 0.0048828125 VQuantization errorThe quantization error is the difference between the actual input signal and the closest representable value.
The quantization error is caused by the limited resolution of the system. The quantization error can be calculated using the following formula:Quantization error = (Full scale range/2^n)/2where n is the number of bits used to represent the input signal.
The full-scale range is the maximum value that the input signal can take on.In this case, the quantization error is:Quantization error = (5 V/2^10)/2Quantization error = 0.00244140625 VTo convert this value to millivolts, we need to multiply by 1000:Quantization error = 0.00244140625 V x 1000Quantization error = 2.44 mVTherefore, the overall resolution of the system is 0.0048828125 V, and the quantization error is 2.44 mV to 3 significant digits.
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Two objects in space have a force of gravity equal to 10 N between them. If the mass of one object is decreased by a factor of 2, what will the new force be?
If one object's mass is reduced by a factor of 2, the new force of gravity between the two will be 5 N.
What happens as the mass of two items decreases to the gravitational force between them?The square of the distance between two things has an inverse relationship with the force of gravity, which depends directly on the masses of the two items. This translates to an increase in gravity force with mass but a decrease in gravity force with increasing distance between objects.
The force of gravity between two items will be as follows if the mass of one object is reduced by a factor of two:
F = (G * m1 * m2) / r²
Assume that object 1's mass is reduced by a factor of 2. This indicates that object 1's new mass is m1/2.
As a result, the new gravitational force between the two objects will be:
F' = (G * (m1/2) * m2) / r²
By combining the two masses, we can make this equation simpler:
F' = (G * m1 * m2) / (2 * r²)
Now, we can see that the new gravitational force is half that of the old one.
F' = 10 N / 2 = 5 N
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The new force of gravity between the two objects is 5 N.
What is force of gravity?The force of gravity, also known as gravitational force, is the force that attracts two objects with mass towards each other. It is one of the fundamental forces of the universe, and it is the force that governs the motion of planets, stars, and galaxies.
The force of gravity is described mathematically by Newton's law of gravitation, which states that the force of gravity between two objects is equal to the product of their masses, divided by the square of the distance between them, multiplied by a constant known as the gravitational constant.
The force of gravity between two objects is given by the formula:
F = G * (m1 * m2) / r^2
where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between them.
In this problem, we are told that the force of gravity between two objects is 10 N. We can assume that the distance between the objects remains the same.
If the mass of one object is decreased by a factor of 2, then the new mass will be half of the original mass. Let's call the original masses m1 and m2, and the new masses m1' and m2'. We can write:
m1' = m1 / 2
m2' = m2
The force of gravity between the two objects with the new masses will be:
F' = G * (m1' * m2') / r^2
= G * (m1/2 * m2) / r^2
= (1/2) * G * (m1 * m2) / r^2
= (1/2) * 10 N
= 5 N
Therefore, the new force of gravity between the two objects is 5 N.
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what is the equivalent resistor for r1 and r2 connected in parallel? note that you can use the calculator located on the top right corner of your labpad
The equivalent resistor for R1 and R2 connected in parallel is (R1 x R2) / (R1 + R2).
An electronic component called a resistor is used to restrict the amount of electrical current that may travel through a circuit. As a passive component, it opposes the flow of electrical current rather than producing any energy. A substance with a high resistance to the passage of electricity, such as metal or carbon, is often used to make resistors.
The equivalent resistor for two resistors R1 and R2 connected in parallel is given by:
1/R' = 1/R1 + 1/R2
where R' is the equivalent resistance of the two resistors.
Therefore,
R' = (R1 x R2) / (R1 + R2)
Therefore, the equivalent resistor for R1 and R2 connected in parallel is (R1 x R2) / (R1 + R2).
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many curves on the roads in the united states are banked at an angle to prevent cars from skidding between lanes. what is a typical range of angles at which curves are banked on interstate highways where cars travel approximately 55mph
The typical range of angles at which curves are banked on interstate highways where cars travel approximately 55mph is 6 degrees to 8 degrees.
Banking is an essential requirement for sharp turns or curves on the roads. It helps in avoiding skidding and accidents. The bank angle depends on the speed of the vehicle, and the radius of the curve.
What is banking?Banking is the inclination of the road surface at a curve with respect to the horizontal plane. This angle helps in preventing the skidding of the vehicle while turning.
The correct angle of banking provides centripetal force on the vehicle, which helps in moving the car toward the center of the curve rather than outwards.
The angle of banking required to bank a curve depends on the speed of the vehicle, the radius of the curve, and the friction between the tires and the road. For a particular radius, there is only one specific angle of banking that is required for a particular speed.
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a bar magnet is falling vertically through a horizontal loop of wire with the south magnetic pole entering the loop first. what is the direction of the induced current (viewed from above) as the north pole leaves the loop?
A bar magnet is falling vertically through a horizontal loop of wire with the south magnetic pole entering the loop first. The direction of the induced current (viewed from above) as the north pole leaves the loop is counterclockwise (viewed from above)
According to Faraday's Law, whenever there is a change in the magnetic flux in a loop of wire, an induced emf (electromotive force) will appear in the wire that produces an induced current. This induced emf will flow in the direction that opposes the change in magnetic flux that generated it, Lenz's Law is a corollary of Faraday's Law. The direction of the induced current opposes the change in magnetic flux that produced it, as specified by Lenz's Law. The current induced in the loop of wire generates a magnetic field that opposes the motion of the magnet, slowing it down. As a result, the current flows in a counterclockwise direction (viewed from above) as the north magnetic pole leaves the loop.
Here is a quick summary of the direction of the induced current: The direction of the induced current is counterclockwise (viewed from above) as the north magnetic pole leaves the loop. In simple words, when the magnet is removed away from the coil, the magnetic field through the coil will change in a way that generates a current that opposes the change. This is to say, when the magnet is removed, the coil sees a reduction in magnetic flux which it doesn’t like, and hence it generates a magnetic field of its own which creates a magnetic flux in the direction of the original magnetic field.
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the distance from earth to the red supergiant betelgeuse is approximately 643 light-years. if it were to explode as a supernova, it would be one of the brightest stars in the sky. right now, the brightest star other than the sun is sirius, with a luminosity of 26 lsun and a distance of 8.6 light-years. how much brighter in our sky than sirius would the betelgeuse supernova be if it reached a maximum luminosity of 1.0*10^10 lsun? 13
Let us assume L be the luminosity of Betelgeuse and L₁ be the luminosity of Sirius.Suppose d is the distance between Earth and Sirius, and D is the distance between Earth and Betelgeuse.
Then, the equation for the luminosity (brightness) would be:L/L₁ = (d/D)²Since the luminosity of Sirius (L₁) is 26 Lsun and the distance from the Earth to Sirius (d) is 8.6 light-years. Thus, the equation becomes:L/26 = (d/D)²The distance from Earth to Betelgeuse (D) is approximately 643 light-years.
If Betelgeuse has a maximum luminosity of 1.0 * 10¹⁰ Lsun, then the equation for Betelgeuse would be:L/1.0 * 10¹⁰ = (d/643)²Substitute the value of L from equation (1) in equation (2):26/1.0 * 10¹⁰ = (8.6/643)²L = (26 × (643/8.6)²) * 1.0 * 10¹⁰L = 2.10 * 10³⁰
lsunBetelgeuse supernova's brightness in our sky than Sirius supernova would be:Betelgeuse supernova's brightness = L / L₁Betelgeuse supernova's brightness = (2.10 * 10³⁰) / 26Betelgeuse supernova's brightness = 8.08 * 10²⁹ times brighter than Sirius. Hence, the correct option is (D) 8.08 × 10²⁹.
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a cosmic catastrophic event occurred that caused the tilt of the earth's axis relative to its plane of orbit to increase from 23.5 degrees to 90 degrees. the most obvious effect of this change would be * 5 points a) the elimination of trade winds. b) an increase in the length of night. c) an increase in the length of a year. d) the elimination of seasonal variation.
The cosmic catastrophic event that occurred, which caused the tilt of the Earth's axis relative to its plane of orbit to increase from 23.5 degrees to 90 degrees, the most obvious effect of this change would be d. the elimination of seasonal variation.
Seasonal variation refers to the occurrence of climatic conditions that can be seen to vary from one season to the next. This seasonal variation is brought about by the tilt of the Earth's axis relative to its plane of orbit, which results in the hemispheres receiving different amounts of sunlight at different times of the year. This results in the appearance of seasons such as winter, spring, summer, and fall. The Earth's axis is tilted at an angle of 23.5 degrees relative to its plane of orbit around the sun. This angle results in the Earth's axis always pointing in the same direction as it orbits the sun, resulting in seasonal variation.
In the absence of this tilt, there would be no seasonal variation, the most noticeable effect of the increased tilt of the Earth's axis from 23.5 degrees to 90 degrees would be the elimination of seasonal variation, as there would no longer be any change in the amount of sunlight that the hemispheres receive. Therefore, option d) the elimination of seasonal variation would be the correct answer.
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if light consisted of classical particles and was sent through a double slit, the pattern on the wall would be which of the following? a single bright fringe dependent on the size of the slit an interference pattern of light and dark fringes a large round dot a bright blob with no distinct shape if light is actually a wave that only behaves like a particle in certain situations then, when light passes through a double slit, the pattern on the wall would be which of the following? a single bright fringe dependent on the size of the slit an interference pattern of light and dark fringes a large round dot two lines proportional to the shape of the two slits
When light passes through a double slit, the pattern on the wall would be an interference pattern of light and dark fringes.
If light consisted of classical particles and was sent through a double slit, the pattern on the wall would be a bright blob with no distinct shape. If light is actually a wave that only behaves like a particle in certain situations then, when light passes through a double slit, the pattern on the wall would be an interference pattern of light and dark fringes.What is a double slit?A double-slit experiment is an experiment that demonstrates the wave-like nature of light. Light passes through two small slits that are positioned close together in a double-slit experiment. Two waves emerge from the two slits and interact with each other, producing an interference pattern on a screen. The pattern will consist of a series of alternating bright and dark fringes, known as interference fringes.
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a passenger weighs 897 n at the weight-guessing booth on the ground. what is his apparent weight at the lowest point on the ferris wheel?
The passenger's apparent weight at the lowest point on the Ferris wheel can be calculated using the formula given below.
Apparent weight = True weight - (density of fluid x volume of the fluid displaced)`` `Where True weight = 897 N` Density of fluid = density of air `Volume of fluid displaced = 0At the lowest point on the Ferris wheel, the passenger experiences maximum weight or a sensation of heaviness. This is because the passenger's weight is equal to the sum of his mass and the centripetal force acting on him. We can thus calculate the passenger's weight or apparent weight at the lowest point on the Ferris wheel using the formula given below.` Apparent weight = True weight + centripetal force`` `Where; `True weight = 897 N `Centripetal force = (mass x velocity²) / radius Let's now calculate the centripetal force;` Centripetal force = (mass x velocity²) / radius = (897 N / 9.81 m/s²) x (2π x 0.84 m / 10 s)² / 0.84 m` `= 32.94 N` Substituting this value in the formula for apparent weight,` Apparent weight = True weight + centripetal force` `= 897 N + 32.94 N` `= 929 N` Therefore, the passenger's apparent weight at the lowest point on the Ferris wheel is 929 N.
At the lowest point of the ferris wheel, the passenger's apparent weight will be the same as their actual weight. Therefore, the apparent weight at the lowest point is 897 N.
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is an edge view of a 2.0 kg square loop, 2.5 m on each side, with its lower edge resting on a frictionless, horizontal surface. a 25 a current is flowing around the loop in the direction shown. what is the strength of a uniform, horizontal magnetic field for which the loop is in static equilibrium at the angle shown?
The strength of the uniform, horizontal magnetic field for which the loop is in static equilibrium at the angle shown is 0.32T.
Let's start by finding the torque acting on the square loop due to the magnetic field. = sinwhere is the torque, is the magnetic field strength, is the current, is the area of the square loop, and is the angle between the plane of the loop and the magnetic field.
The square loop is in static equilibrium, which means the net force and net torque acting on it are zero. Since the loop is resting on a frictionless horizontal surface, the normal force and weight of the loop will cancel each other out.
The torque acting on the square loop due to the magnetic field is = sin= 25A × (2.5m)² × sin(60°)= 125JThe torque due to the magnetic field is balanced by an equal and opposite torque due to the tension in the wire. The tension in the wire is acting at an angle of 45° to the horizontal, so we can resolve it into horizontal and vertical components.
The horizontal component is equal to the magnetic torque, and the vertical component is equal to the weight of the loop.Using trigonometry, we can find the tension in the wire.Tcos(45°) = T = /cos(45°)= 125J/cos(45°)= 177JThe weight of the square loop is = = 2.0kg × 9.8m/s²= 19.6NTherefore, the vertical component of the tension in the wire is equal to the weight of the square loop.
Tsin(45°) = Tsin(45°) = 19.6NT = 27.7NThe horizontal component of the tension in the wire is equal to the magnetic torque.Tcos(45°) = Tcos(45°) = 125JT = 177JThe magnetic field strength is = /(sin)= 125J/(25A × (2.5m)² × sin(60°))= 0.32TTherefore, the strength of the uniform, horizontal magnetic field for which the loop is in static equilibrium at the angle shown is 0.32T.
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determine the volume change in ft3, when 1 lb of water, initially saturated liquid, is heated to saturated vapor while pressure remains constant at 450 lbf/in2
The volume change will be;6.80465 ft3/lb. (which is equal to 6.80465 ft3). The volume change in ft3, when 1 lb of water, initially saturated liquid, is heated to saturated vapour while pressure remains constant at 450 lbf/in2 is 6.80465 ft3.
When 1 lb of water, initially saturated liquid, is heated to saturated vapour while pressure remains constant at 450 lbf/in2, the volume change in ft3 can be determined as follows;
Firstly, use the given information to calculate the specific volume of water using the table of the properties of superheated water from the steam tables at 450 lbf/in2. The specific volume of water is calculated to be 0.01615 ft3/lb.
Then, determine the specific volume of the water in the vapour state at 450 lbf/in2 using the steam tables. It is equal to 6.8208 ft3/lb. The difference in the specific volume of the water in its two states (initially saturated liquid to saturated vapour) is then determined to be 6.8208 - 0.01615 = 6.80465 ft3/lb.
Since 1 lb of water has been heated from a saturated liquid state to a saturated vapour state, the change in volume will be equal to the difference in the specific volumes of the water in its two states.
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two football players collide head-on in midair while chasing a pass. the first player has a 115 kg mass and an initial velocity of 4.00 m/s in the positive x direction, while the second player has a 135 kg mass and initial velocity of 3.00 m/s in the negative x direction. what is the x component of their velocity just after impact if they cling together? (indicate the direction with the sign of your answer.)
Answer: The x component of their velocity just after impact is 0.22 m/s in the positive x direction.
Explanation:
According to law of conservation of momentum, the total momentum of a system is conserved if there are no external forces acting on it.
That is,
p=m1v1 + m2v2
m1 and v1 is the mass and velocity of the first player.
m2 and v2 is the mass and velocity of the second player.
p = (115 kg)(4.00 m/s) + (135 kg)(-3.00 m/s)
p = 460 kg m/s - 405 kg m/s
p = 55 kg m/s in the positive x direction
After collision,
let m3 is the combined mass and v3 is the velocity after collision.
p=m3*v3
m3= (115 kg)+(135 kg) = 250 kg
55 kg m/s = 250 kg* v3
v3= (55 kg m/s) /(250 kg) = 0.22m/s
The x component of their velocity just after impact if they cling together is -0.243 m/s.
First player's mass, m1 = 115 kg, Initial velocity of 1st player, u1 = 4.00 m/s, Second player's mass, m2 = 135 kg, Initial velocity of 2nd player, u2 = -3.00 m/s
X component of their velocity just after impact, v, Since they cling together, therefore the final velocity of their combined system would be v.X-momentum before collision = X-momentum after collision
m1 u1 + m2 u2 = (m1 + m2) vv = (m1 u1 + m2 u2) / (m1 + m2)
Putting the values in the above equation,v = (115 × 4.00 + 135 × (-3.00)) / (115 + 135)v = -0.243 m/s.The x component of their velocity just after impact is -0.243 m/s in the negative x direction. Therefore, the answer to the given question,the x component of their velocity just after impact if they cling together, is (-0.243 m/s).
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the design considerations for a timing mechanism require that a mass of 1.6 g should undergo 5 oscillations per second when it is attached to a spring. what should the force constant of a spring be to achieve this?
The force constant of the spring should be approximately 250 N/m to achieve 5 oscillations per second with a mass of 1.6 g.
To find the force constant of the spring, we can use the formula for the frequency of oscillations of a mass-spring system:
f = (1/2π) * √(k/m)
where f is the frequency in oscillations per second (Hz), k is the force constant of the spring (N/m), and m is the mass (kg).
First, let's convert the mass from grams to kilograms:
m = 1.6 g = 0.0016 kg
We are given that the frequency of oscillations should be 5 Hz. Now, we can rearrange the formula to solve for k:
k = (2π * f)^2 * m
Now, plug in the values for f and m:
k = (2π * 5)^2 * 0.0016
Calculate the value:
k ≈ 250 N/m
So, the force constant of the spring should be approximately 250 N/m to achieve 5 oscillations per second with a mass of 1.6 g.
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the universe is made up of . which phrase best completes the sentence? responses several galaxies several galaxies one galaxy one galaxy thousands of galaxies thousands of galaxies no galaxies no galaxies
The universe is made up of thousands of galaxies. This is because the universe is an incredibly vast expanse of space that contains billions of galaxies, including our own Milky Way galaxy.
A galaxy is a collection of stars, stellar remains, interstellar gas, dust, and dark matter that are gravitationally linked together. the Solar System's home galaxy, the Milky Way. Galaxies vary in size from dwarfs with fewer than 100 million stars to the largest known galaxies, supergiants with one hundred trillion stars orbiting their galaxy's centre of mass. Galaxies are thought to contain an average of 100 million stars.
Only a small percentage of the mass in a typical galaxy is visible in the shape of stars and nebulae; the majority of the galaxy's mass is dark matter. Supermassive black holes are a typical component of galaxy cores.
Each galaxy contains billions of stars, and many of those stars likely have planets orbiting them. The universe is also home to countless other celestial bodies, including black holes, comets, asteroids, and more. Overall, the universe is a fascinating and mysterious place that continues to captivate scientists and astronomers alike.
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a battery made up of two cells joined in series supply current to an external resistance of each cell is 0.6v and 3 ohms respectively. calculate 1 the current flowing in the external resistance 2 the thermal potential difference 3 the lost voltage
Answer:
We have a battery here, composed of two cells joined in series, which is supplying current to an external resistance. The voltage of each cell is given as 0.6 volts and the resistance is 3 Ohms. In order to solve the problem, we need to calculate three things: the current flowing in the external resistance, the thermal potential difference and the lost voltage.
First, let's calculate the current flowing in the external resistance. Using Ohm's Law, we can find the current as I = V/R, where V is the total voltage of the battery (i.e. 2*0.6=1.2V) and R is the external resistance, which is given as 3 Ohms. Therefore, I = 1.2/3 = 0.4 amps.
Next, let's calculate the thermal potential difference. This is the amount of heat generated by the current flowing through the external resistance, and is given by the formula P = I^2*R, where P is the power, I is the current, and R is the resistance. Plugging in the values, we get P = 0.4^2*3 = 0.48 watts. Since we know that power is equal to voltage times current (P = VI), we can rearrange the formula to get V = P/I, which gives us V = 0.48/0.4 = 1.2 volts.
Finally, we need to calculate the lost voltage. This is the voltage drop that occurs across each cell due to internal resistance. We can use the formula V_lost = I*R_int, where R_int is the internal resistance. Since we know the current and the resistance of the external load, we can use the total voltage of the battery to find the internal resistance. Recall that the total voltage of the battery is 1.2V. Therefore, V_lost = I*R_int, or R_int = V_lost/I. We know that the voltage drop across each cell is equal, so we can divide the lost voltage by 2 to get the voltage drop across each cell. Therefore, V_cell = V_lost/2 = (0.4)*(R_int/2). Plugging in the values, we get V_cell = 0.4*(1.2-0.4*3)/2 = 0.06 volts.
In summary, the current flowing in the external resistance is 0.4 amps, the thermal potential difference is 1.2 volts, and the lost voltage across each cell is 0.06 volts.
bats chirp at high frequencies that humans cannot hear. they use the echoes to detect small objects, such as insects, as small as one wavelength. if a bat emits a chirp at a frequency of 60.0 khz and the speed of sound waves in air is 340 m/s, what is the size in millimeters of the smallest insect that the bat can detect?
If a bat emits a chirp at a frequency of 60.0 khz and the speed of sound waves in air is 340 m/s, the size in millimeters of the smallest insect that the bat can detect is 2.84 mm.
The size in millimeters of the smallest insect that a bat can detect can be determined using the equation:
d = λ / (2 × sinθ)
where d is the size of the object, λ is the wavelength of the sound, and θ is the angle between the incoming sound and the reflected sound.
To find the size of the smallest insect that a bat can detect when emitting a chirp at a frequency of 60.0 kHz, the wavelength of the sound must first be calculated.
The wavelength of sound can be calculated using the formula:
λ = v/f
where λ is the wavelength of the sound, v is the speed of sound waves in air, and f is the frequency of the sound.
Substituting the given values, we get:
λ = (340 m/s)/(60,000 Hz)
λ = 0.00567 m
Next, the angle between the incoming sound and the reflected sound must be determined.
For the smallest insect, the angle is 90 degrees.
Substituting the values into the equation:
d = λ / (2 × sinθ)
d = 0.00567 m / (2 × sin90)
d = 0.00567 m / 2
d = 0.00284 m or 2.84 mm
Therefore, the size in millimeters of the smallest insect that the bat can detect is 2.84 mm.
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uv radiation having a wavelength of 113 nm falls on platinum metal, whose work function is 6.35 ev. what is the maximum kinetic energy (in ev) of the ejected photoelectrons?
Uv radiation having a wavelength of 113 nm falls on platinum metal, whose work function is 6.35 ev. The maximum kinetic energy of the ejected photoelectrons is 4.62 eV.
The maximum kinetic energy (KEmax) of the ejected photoelectrons can be calculated using the equation:
KEmax = E_photon - Work_function
First, convert the given wavelength (113 nm) to energy (E_photon) using the formula:
E_photon = (hc) / λ
where h (Planck's constant) = 4.1357 x 10^(-15) eV·s, c (speed of light) = 2.998 x 10^8 m/s, and λ (wavelength) = 113 nm.
Convert λ to meters: λ = 113 x 10^(-9) m
Now, calculate E_photon:
E_photon = (4.1357 x 10^(-15) eV·s) * (2.998 x 10^8 m/s) / (113 x 10^(-9) m)
E_photon = 10.97 eV
Next, subtract the work function (6.35 eV) to find the maximum kinetic energy:
KEmax = 10.97 eV - 6.35 eV = 4.62 eV
The maximum kinetic energy of the ejected photoelectrons is 4.62 eV.
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suppose you moved two objects farther apart. how would this affect the force of gravity between those objects?
This implies that as the distance between two objects increases, the force of gravity between them decreases.
If you moved two objects farther apart, the force of gravity between those objects would decrease.What is gravity?Gravity is a fundamental force that is responsible for the attraction between any two masses, any two celestial bodies, or any particles that have mass. According to Newton's law of universal gravitation, the magnitude of gravitational force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.So, if you moved two objects farther apart, the distance between them would increase. According to the inverse square law, if the distance between the two objects increases, the gravitational force between them decreases.
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A fish, a wooden block, an egg, and a rock are placed in a container filled with water. None of the objects are moving.
Which one has the highest density?
A substance's density is a measurement of how heavy it is in relation to its size. If immersed in water, an object will float if its density is lower than that of the water, whereas it will sink if its density is higher.
What is a substance's density?
A substance's density is defined as its mass every unit volume (more specifically, the cubic mass density; sometimes known as specific mass). Although the Roman letter D may also be used, the sign most frequently used for dense is (the misspelling Greek letter rho). The formula for density is mass divided by quantity
Why is a substance's density a valuable property?
Because increasing a substance's mass results in an increase in mass rather than density, density is an intense attribute. A homogeneous object has a density that is equal to its whole mass multiplied by its entire volume at all places.
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Calculate the amount of heat required to convert 300 grams at 75 degrees Celsius into steam at 100 degrees Celsius, as the specific heat of water is 4186 J/kg.h and the latent heat of sublimation is 2.66000000
Answer:
the total amount of heat required to convert 300 grams of water at 75 degrees Celsius into steam at 100 degrees Celsius is 3,940,500 J + 798,000 J = 4,738,500 J.
Explanation:
To convert 300 grams of water at 75 degrees Celsius to steam at 100 degrees Celsius, the amount of heat required can be calculated as follows:
First, we need to heat the water from 75 degrees Celsius to 100 degrees Celsius:
Heat required = mass x specific heat x temperature change
Heat required = 300 g x 4186 J/kg°C x (100°C - 75°C)
Heat required = 300 g x 4186 J/kg°C x 25°C
Heat required = 3,940,500 J
Once the water reaches its boiling point at 100 degrees Celsius, we need to supply additional heat to convert the water into steam at the same temperature:
Heat required = mass x latent heat of sublimation
Heat required = 300 g x 2.66000000 J/g
Heat required = 798,000 J