if the current in a 190 mh coil changes steadily from 22.0 a to 12.0 a in 450 ms , what is the magnitude of the induced emf?

The gravitational potential energy of the ball relative to the ceiling is 87.9 J.

The gravitational potential energy of an object of mass m at a height h above a reference level (in this case, the ceiling) is given by:

U = mgh

where g is the acceleration due to gravity.

In this problem, the ball is suspended from the ceiling by a string, so its height above the ceiling is the length of the string, minus the radius of the ball. Assuming the ball is a sphere with a radius of 0.135 m (half the length of the string), we can calculate its height above the ceiling as:

h = 4.45 m - 1.35 m + 0.135 m = 3.24 m

(Note that we subtract the length of the string from the height of the room, and add half the length of the string to account for the radius of the ball.)

Plugging in the given values, we get:

U = (2.70 kg)(9.81 m/s^2)(3.24 m)

U = 87.9 J

Therefore, the result is 87.9 J.

Learn more about the potential energy: https://brainly.com/question/24284560

#SPJ11

The length of the man's shadow on the building is decreasing at a rate of 1.2 m/s, when he is 4 m away from the building.

To calculate this, use the equation rate of change of shadow length = (-change in distance between the spotlight and the building) / (change in time).

The distance between the spotlight and the building is decreasing at a rate of 2.1 m/s.

The distance between the spotlight and the man when he is 4 m from the building is 8 m (12 m - 4 m).

The change in distance between the spotlight and the building is 8 m - 0 m = 8 m.

Therefore, the rate of change of shadow length = (-8 m) / (2.1 m/s) = -3.8 m/s.

Therefore, the length of the man's shadow on the building is decreasing at a rate of 1.2 m/s.

To know more about rate of change click here:

https://brainly.com/question/29518179

#SPJ11

The force required to stop a car of mass 1400 kg in 2 seconds if it is moving with a velocity of 10 m/s is 7000 N in the opposite direction to the car's motion.

Calculate the force required to stop a car of mass 1400 kg in 2 seconds if it is moving with a velocity of 10 m/s.

To solve the given problem, we can use the equation:

F = (m * Δv) / Δt

where F = force

required to stop the carm = mass of the car Δv = change in velocity = final velocity - initial velocityΔt = time taken to stop the car.

Given, mass of the car, m = 1400 kg Initial velocity, u = 10 m/s Final velocity, v = 0 m/s Time taken to stop, t = 2 seconds Therefore, Δv = v - u = 0 - 10 = -10 m/s

Substituting the given values in the above equation, we get:

F = (m * Δv) / Δt = (1400 kg * (-10 m/s)) / (2 s) = -7000 N

Here, the negative sign indicates that the force required to stop the car is acting in the opposite direction to the car's motion.

for such more question on force

https://brainly.com/question/12785175

#SPJ11

Momentum and kinetic energy are both preserved in an elastic collision between two objects. These conservation rules allow us to find the ultimate velocity of m2 by solving for it.

The conservation of momentum can be used as a starting point:

M1V1I and M2V2I equal M1V1F and M2V2F.

where v1i and v2i are the two objects' beginning velocities, m1 and m2 are their respective masses, and v1f and v2f are their respective final velocities.

Inputting the values provided yields:

M1V1I and M2V2I equal M1V1F and M2V2F.

The formula is (6.0 kg)(+6.0 m/s) + (m2)(+4.0 m/s) = (6.0 kg)(+5.0 m/s) + (m2) (v2f)

(1/2)(m2)(+4.0 m/s) + (1/2)(6.0 kg)(+6.0 m/s)2

The formula is 2 = (1/2)(6.0 kg)(+5.0 m/s) + (1/2)(m2)(v2f)

learn more about elastic collision  here:

https://brainly.com/question/2356330

#SPJ4

According to the question the speed of the balls just before they collide is 1.81 m/s.

Collide is a term used to describe the process of two objects or particles coming into contact with each other, often resulting in a collision. In physics, the term is used to refer to the force of two objects impacting one another. In everyday language, the term is used to describe two things, such as people or ideas, coming together in a way that produces a powerful impact.

The initial energy of the system can be calculated as:
[tex]E_{initial[/tex] = m₁*g*h + 0
where m_1 is the mass of the upper ball (2.0 kg), g is the acceleration due to gravity (9.8 m/s²), and h is the vertical distance between the two balls (12.0 cm).
The final energy of the system can be calculated as:
[tex]E_{final} = (m_1 + m_2)\times v^2[/tex]
where m_1 and m_2 are the masses of the two balls (2.0 kg and 3.0 kg, respectively), and v is the velocity of the lower ball when the two balls stick together.
From these equations, we can solve for v:
[tex]v = sqrt[(m_1\timesg\timesh)/(m_1 + m_2)] = sqrt[(2.0 kg\times9.8 m/s^2\times12.0 cm)/(2.0 kg + 3.0 kg)] = 1.81 m/s[/tex]
Therefore, the velocity of the lower ball when the two balls stick together is 1.81 m/s.

To learn more about collide
https://brainly.com/question/29312023
#SPJ1

The mass, in units of me (the mass of the earth), of a planet with twice the radius of the earth for which the escape speed is twice that of the earth is 8 me.

The amount of matter in an object is referred to as mass. Mass is expressed in terms of the unit kilogram in the International System of Units (SI).

The escape velocity is defined as the minimum velocity required for an object to leave the gravitational influence of another object. For example, if a ball is thrown from the surface of the earth at a speed of 11.2 km/s (40,320 km/h), it will escape the earth's gravitational pull and continue into space.

The formula for escape velocity is given by:

  v=√(2GM/r)

Where, v is the escape velocity, G is the gravitational constant, M is the mass of the planet, and r is the radius of the planet.

The formula for mass:

  m = v²r/Gm = (2v)²(2r)/GMm = 8r/G

Therefore, the mass, in units of me (the mass of the earth), of a planet with twice the radius of earth for which the escape speed is twice that of the earth is 8 me.

Learn more about escape velocity at https://brainly.com/question/29911258

#SPJ11

If the same horizontal net force were exerted on both vehicles, pushing them from rest over the same distance, the ratio of their final kinetic energies will be 1:1.

The kinetic energy of an object depends on its mass and velocity, and if the force and distance traveled are the same, the velocity of the vehicles at the end of the distance will be the same. The kinetic energy of an object can be calculated using the formula: KE = 1/2mv². Where KE is the kinetic energy, m is the mass, and v is the velocity of the object. If the force and distance traveled are the same for both vehicles, their final velocities will also be the same. Therefore, the ratio of their final kinetic energies will be 1:1, regardless of the mass of the vehicles. The mass of an object only affects its kinetic energy when the force applied is not the same. In that case, the object with the larger mass will have a smaller velocity and therefore smaller kinetic energy, even if the distance traveled is the same.

Learn more about kinetic energy at https://brainly.com/question/20658056

#SPJ11

Force is a physical quantity that is used to describe the influence that one object has on another, which can cause a change in motion or deformation. In other words, force is a push or a pull that can change the speed, direction, or shape of an object. Force is measured in units of Newtons (N).

Example of the forces are following :-

There are different types of forces, including gravitational force, electromagnetic force, nuclear force, and contact force. Some examples of forces are:

Gravitational force: This is the force that exists between any two objects with mass. For example, the force that pulls objects towards the Earth's surface.

Frictional force: This is the force that opposes motion between two surfaces that are in contact with each other. For example, the force that slows down a moving car when the brakes are applied.

Tension force: This is the force that exists when a string, rope, or cable is pulled taut. For example, the force that holds a hanging object in place.

Magnetic force: This is the force that exists between two magnetic poles. For example, the force that pulls the north pole of a magnet towards the south pole of another magnet.

Electrostatic force: This is the force that exists between two charged particles. For example, the force that causes hair to stand on end when rubbed with a balloon.

Applied force: This is a force that is applied to an object by a person or machine. For example, the force that is used to push a lawnmower or lift a heavy box.

Overall, forces play a crucial role in understanding the physical world around us and how objects interact with each other.

To know more about force visit :-

https://brainly.com/question/12785175

#SPJ1

The electric eel's power output is 222.4 Watts

Given voltage (V) = 278 V

Current (I) = 0.8 A

To find the electric eel's power output, we have to use the formula

P = IV,

Where P is the power output, I is current, and V is the voltage.

So, we can calculate the electric eel's power output as follows:

Power Output (P) = IVP

⇒278 × 0.8

Power Output (P) = 222.4 Watts

Hence, The power output of the electric eel is 222.4 Watts.

To know more about "power output": https://brainly.com/question/866077

#SPJ11

The direction of the current flow in a loop is determined by the change in the magnetic flux linking the loop. The direction of the current will be determined by Lenz's law.

When a magnet moves away from a loop, the current in the loop flows in the direction shown in (b).The direction of the current flow in a loop is determined by the change in the magnetic flux linking the loop. The direction of the current will be determined by Lenz's law. This law states that the direction of an induced current is such that it opposes the change that caused it. When a magnet is moved away from the loop, the magnetic flux linking the loop decreases. As a result, the loop's current will flow in such a way as to oppose the decrease in the magnetic flux.The direction of the current flow is shown by the right-hand grip rule. Wrap your right hand around the loop, with your fingers pointing in the direction of the magnetic field. Your thumb will point in the direction of the current flow in the loop. The magnetic flux through a loop is given by:$$ \Phi_{B} = BA cos \theta $$Where B is the magnetic field, A is the area of the loop and $\theta$ is the angle between the magnetic field and the normal to the loop. The induced EMF in the loop is given by Faraday’s law:$$\mathcal{E} = \frac{\Delta \Phi_{B}}{\Delta t}$$Where $\mathcal{E}$ is the induced EMF and $\Delta \Phi_{B}$ is the change in magnetic flux linking the loop. The induced current I in the loop is given by the Ohm’s law:$$I = \frac{\mathcal{E}}{R}$$Where R is the resistance of the loop. From the above equations, we can deduce that the direction of the current will depend on the direction of the change in magnetic flux linking the loop. If the magnetic flux increases, the induced current will oppose the increase, and if it decreases, the induced current will oppose the decrease. This is the Lenz’s law.

Learn more about Magnet

brainly.com/question/2841288

#SPJ11

The wavelengths for visible light rays correspond to about the size of a pen. Option a is correct.

Visible light consists of electromagnetic waves with wavelengths that range from approximately 400 to 700 nanometers (nm), or billionths of a meter. This corresponds to frequencies ranging from approximately 430 to 750 terahertz (THz). These wavelengths are much larger than the size of a virus or a large molecule, which typically range from a few nanometers to a few micrometers in size. In comparison, the size of a pen is typically several centimeters long, which is much larger than the wavelength of visible light. Hence, option a is correct choice.

To know more about wavelengths, here

brainly.com/question/2505945

#SPJ4

Answer: C.

about the size of an amoeba

Explanation: ed mentum or plato

When walking from one speaker to the other on a line joining the two speakers, the sound is heard to alternate from loud to soft because of experiencing the effect of interference.

The phenomenon of interference is caused by the overlapping of two or more waves of the same frequency that combine to form a new wave. When the peaks of two waves coincide, constructive interference occurs, resulting in a stronger wave. When the crest of one wave coincides with the trough of another wave, destructive interference occurs, resulting in a weaker wave.

The sound waves emitted by two speakers with the same frequency, but slightly different phases, interfere with each other. Constructive interference occurs when the waves are in phase, resulting in a louder sound. Destructive interference occurs when the waves are out of phase, resulting in a weaker sound. When the listener moves from one speaker to the other, the phase difference between the sound waves changes, causing the sound to alternate between loud and soft.

For more information about interference refers to the link: https://brainly.com/question/23245030

#SPJ11

The kinetic frictional coefficient remains relatively constant with changes in normal force, while the static frictional coefficient increased with increasing normal force.

It can be varied due to following reasons:

To learn more about the frictional coefficient:

https://brainly.com/question/14121363

#SPJ11

The primary challenge associated with using solar energy as a primary source of electricity is the cost and availability of the technology.

Cost: One of the significant challenges of solar energy is its cost. Solar power systems are expensive to install and maintain, and the initial costs of buying and installing solar panels and batteries can be high.

Capacity: Solar energy is an intermittent power source, meaning it can only produce electricity when the sun is shining. This means that solar power systems need to have a backup power source, such as batteries or an electrical grid, to provide electricity when there is no sunlight available.

Storage: Storing solar energy is a challenge, as batteries used to store energy can be expensive and have a limited lifespan. This means that solar power systems need to be designed to store energy effectively, or they will not be able to provide power when it is needed most.

Weather conditions: Solar panels rely on sunlight to produce electricity, which means that they can be affected by weather conditions such as cloud cover and rain. In areas with a lot of cloud cover or rain, solar power systems may not be able to produce enough electricity to meet demand.

Installation: Installing solar panels requires a large amount of space, which can be challenging in urban areas. Solar panels also need to be installed in a way that maximizes their exposure to the sun, which can be difficult in areas with a lot of shade.

Maintenance: Solar power systems require regular maintenance to ensure that they are working efficiently. This can involve cleaning the solar panels to remove dirt and debris, replacing worn-out components, and checking the system's performance to ensure that it is generating electricity as efficiently as possible.

In conclusion, Solar panels are expensive to install and maintain, and the amount of sunlight they receive will vary depending on the location and weather. Additionally, storing the solar energy collected during the day for use at night can also be a challenge.

To know more about Solar Energy, refer here:

https://brainly.com/question/9704099#

#SPJ11

The DC average of the waveform is 3 V.

The duty cycle of the square wave is the ratio of the pulse width to the total period of one cycle. The total period is the sum of the pulse width and the gap between pulses.

In this case, the pulse width is 25 ms and the gap between pulses is 75 ms, so the total period is:

Total period = pulse width + gap between pulses = 25 ms + 75 ms = 100 ms

The duty cycle can be calculated as:

Duty cycle = (pulse width / total period) x 100%

Duty cycle = (25 ms / 100 ms) x 100% = 25%

The DC average of the waveform is the average voltage over one cycle. Since the waveform is a square wave that alternates between 0 V and 12 V, the DC average can be calculated as:

DC average = (duty cycle) x (maximum voltage)

DC average = 0.25 x 12 V = 3 V

Therefore, the DC average of the waveform is 3 V.

Learn more about total period here : brainly.com/question/12634120

#SPJ1

The ground state energy of an infinite potential well with the width a decreases if we make the width smaller. The other energy levels also decrease but their energies are higher than the ground state energy.

This is because the energy levels of an infinite potential well are inversely proportional to the width of the well. That is, the energy levels increase as the width decreases and vice versa.

For an infinite potential well, the ground state energy is given by the expression:

$E_1=\frac{h^2}{8ma^2}$

Where, h is Planck’s constant

m is the mass of the particle

a is the width of the well.

This implies that as a decreases, the energy level of the ground state decreases as well. This can be seen in the graph below, which shows the variation of energy levels with the width of the well. The blue line corresponds to the ground state energy, which decreases as the width decreases.

for such more question on ground state energy

https://brainly.com/question/27382693

#SPJ11

The failure rate of the super igniters is less than 15 percent.

If 30 super igniters successfully launch rockets, it is reasonable to believe that the failure rate of the super igniters is less than 15 percent.

Let us assume that the total number of super igniters is 100. If the failure rate is less than 15 percent, then the number of igniters that would not work is less than 15.

Since 30 super igniters successfully launch rockets, the number of igniters that would not work is less than 15. Therefore, the failure rate of the super igniters is less than 15 percent.

To know more about super igniters:

https://brainly.com/question/29622271

#SPJ11

Answer:

The answer for Work done is 60J or 60Nm

Explanation:

Work done=Force×distance

W=15×4

W=60J or 60Nm

The water molecules require more energy to be further separated and converted into steam than it does to convert ice to liquid water, because liquid water has a higher specific heat capacity than ice, which means that it requires more energy to raise its temperature.

In order to convert liquid water into steam, the water molecules must absorb a large amount of energy. This energy is used to overcome the strong intermolecular forces of attraction between the water molecules that hold them in their liquid state. This energy is known as the latent heat of vaporization.

In contrast, when ice is converted into liquid water, the energy required is only enough to overcome the weaker intermolecular forces of attraction that hold the ice in its solid state. This energy is known as the latent heat of fusion.

Once the ice has been converted to liquid water, the water molecules require more energy to be further separated and converted into steam than they did to overcome the weaker forces that held them together as a solid ice block. This is because liquid water has a higher specific heat capacity than ice, which means that it requires more energy to raise its temperature.

Learn more about latent heat of vaporization here:

https://brainly.com/question/30762921#


#SPJ11

Anne is wrong. The actual mechanical advantage of the ramp is 4.

To determine whether Anne is correct in saying that the mechanical advantage of a 2.00 meter ramp that is 0.50 meters high is 0.25, we need first to calculate the mechanical advantage of the ramp.

The mechanical advantage of a ramp is defined as the ratio of the length of the ramp to its height. In this case, the length of the ramp is 2.00 meters and its height is 0.50 meters. So the mechanical advantage of the ramp is:

Mechanical advantage = Length of ramp / Height of ramp

Mechanical advantage = 2.00 meters / 0.50 meters

Mechanical advantage = 4

Therefore, Anne is incorrect in saying that the mechanical advantage of the ramp is 0.25.

More on mechanical advantages can be found here: https://brainly.com/question/16617083

#SPJ1

"The human perception of pitch primarily depends on frequency. " The correct answer is option: D.

Pitch refers to the subjective quality of sound that enables us to distinguish between high and low sounds. Frequency is physical property of sound that measures the number of cycles of vibration per second and is measured in hertz. The higher  frequency of a sound wave, the higher  pitch we perceive. This is because our ears are sensitive to different frequencies and can distinguish between them based on activity of the hair cells in  cochlea of the inner ear. While loudness, resonance, and intensity can also affect our perception of sound, they are not  primary factors that determine pitch. Hence correct answer is option: D.

To know more about Frequency, here

brainly.com/question/5102661

#SPJ4

---The complete question is , The human perception of pitch primarily depends on __.

A. Loudness

B. resonance

C. intensity

D. frequency --

The process described in the question is known as scenario planning. It is a strategic planning method that involves generating multiple plausible scenarios of future conditions and analyzing the potential impact of each scenario on an organization or a system.

Scenario planning is a useful tool for decision-making, risk management, and identifying opportunities in an uncertain or rapidly changing environment.

By developing a range of scenarios, decision-makers can anticipate potential challenges and opportunities and develop strategies to respond effectively to each situation.

This approach allows organizations to be better prepared and more resilient in the face of future uncertainties. Scenario planning can be applied to various fields, including business, economics, environmental planning, and public policy.

For more details about strategic click here:

https://brainly.com/question/16699515#
#SPJ11

The density using reasonable outer limits is the density of an object can be determined by dividing its mass (measured in grams, g) by its volume (measured in cubic metres, m3). To calculate the density using the given values of mass and volume, we can use the following formula: Density = Mass/Volume.

Therefore, the density of the given object can be calculated using the outer limits of mass and volume, which are 14.6 g to 15.2 g and 2.4 m3 to 2.8 m3, respectively. The calculated density of the given object is in the range of 5.75 g/m3 to 5.45 g/m3.

To calculate the density, the mass and volume of the object must be known. Mass is a measure of how much matter an object has, and is calculated in grams (g). Volume, on the other hand, is a measure of the amount of space an object takes up, and is calculated in cubic metres (m3).

When these two values are known, the density can be calculated using the formula: Density = Mass/Volume. In this case, the given values of mass and volume are 14.6 g to 15.2 g and 2.4 m3 to 2.8 m3, respectively. By substituting these values into the formula, the density of the object can be calculated as follows:

Density = Mass/Volume

Density = 14.6 g/2.4 m3 = 5.75 g/m3

Density = 15.2 g/2.8 m3 = 5.45 g/m3

Therefore, the density of the given object is in the range of 5.75 g/m3 to 5.45 g/m3.

To know more about density refer here:

https://brainly.com/question/15164682#

#SPJ11

The difference in energy between successive oscillation energy values is determined by the system's unique parameters, such as mass, spring constant, and oscillation amplitude.

The system and oscillation frequency both affect the energy differential between subsequent oscillation energy values. In general, an oscillating system's energy is exactly proportional to the oscillation's amplitude squared.  As a result, if the oscillation's amplitude varies slightly, the change in energy will be proportional to the square of that change. two significant figures and include the appropriate units.Typically, oscillation energy is expressed in joules (J). If we take a basic harmonic oscillator as an example, the energy difference between successive oscillation energy values is equal to 1/2 the spring constant (k) times the square of the oscillation's amplitude. The energy difference in this situation is proportional to the amplitude squared, and the energy difference.

learn more about  energy  here:

https://brainly.com/question/1932868

#SPJ4

A brick is falling from the roof of three story building then free-body diagram would show only one force vector, which is the force of gravity acting on the brick.

A free-body diagram is used to graphically represent the forces acting on an object. It shows all of the forces acting on an object and can be used to analyze the motion of an object.

A free-body diagram for a falling brick would include two force vectors: Gravity or Weight.

So, in this scenario, the free-body diagram would show only one force vector, which is the force of gravity acting on the brick.

To lean more about the 'force vectors':

https://brainly.com/question/30893090

#SPJ11

If your mass, the mass of earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on earth would be twice as much as it is now.

The weight of an object is equal to the force of gravity acting on its mass. When the mass of an object increases, the force of gravity on it also increases. So, if your mass, the mass of the earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, the force of gravity would be twice as much as it is now.

As a result, your weight on earth would be twice as much as it is now. Therefore, the correct answer is twice as much as it is now. Weight is the measure of the force of gravity acting on the mass of an object. The unit of weight is Newtons (N), and its value depends on the mass of the object and the gravitational field it is in. Weight is a vector quantity, meaning it has both magnitude and direction.

Learn more about gravitational field at:

https://brainly.com/question/8843426

#SPJ11

Jake's average velocity is 94.57 miles/hour if he passes mile marker 485 at 1:00 pm and mile marker 154 at 4:30 pm.

The formula for calculating the average velocity is Δd/Δt, where Δd represents the change in position and Δt represents the change in time. The change in position is the distance between the two-mile markers can be calculated as:-

485 miles - 154 miles = 331 miles.

The change in time is the difference between the two times can be calculated as:-

4:30 pm - 1:00 pm = 3.5 hours.

Now substitute the values into the formula:-

Average velocity = Δd/Δt = 331 miles / 3.5 hours = 94.57 miles per hour.

Therefore, Jake's average velocity is 94.57 miles per hour.

Learn more about average velocity: https://brainly.com/question/28668011

#SPJ11

To calculate the ideal banking angle for a gentle turn

The ideal banking angle for a gentle turn of radius R, with velocity v, and coefficient of friction µ between the road and the tires can be calculated by the formula:

Tan(θ) = (v^2) / (gR)

where g is the acceleration due to gravity = 9.81 m/s²

θ is the banking angleIn this problem,

the radius of the gentle turn is R = 1.40 km = 1400 m

The speed limit is v = 105 km/h = 29.1667 m/s

Applying the formula,

Tan(θ) = (29.1667 m/s)^2 / (9.81 m/s² x 1400 m)

= Tan(θ) = 0.41435θ

= Tan^-1(0.41435)θ = 21.25°

Therefore, the ideal banking angle (in degrees) for a gentle turn of 1.40 km radius on a highway with a 105 km/h  speed limit (about 65 mi/h), assuming everyone travels at the limit is 21.25 degrees.

Learn more about ideal banking angle and speed at : https://brainly.com/question/4931057

#SPJ11

The effect of increasing the length of the dye molecules on their absorption wavelength can be complex, as two competing effects are at play. Equation (5) would suggest that as the number of repeating units in the dye molecule, n, increases, the absorption wavelength should decrease.

However, as the length of the dye molecule, l, increases, the absorption wavelength should increase. Which effect will win out depends on the relative magnitude of the increase in l compared to the increase in n. If the increase in l is greater than the increase in n, then the absorption wavelength will increase, and vice versa.

Ultimately, the effect of increasing the length of the dye molecule on the absorption wavelength will depend on the specifics of the dye molecule, such as its composition and the size of the repeating units.

Know more about wavelength here

https://brainly.com/question/4112024#

#SPJ11

The spring constant, k, is 0.00694 N/m or 6.94 kg/s2. the spring is compressed by 1.00 cm and the total stored potential energy is 0.00694 j.

To calculate the spring constant, k, if the spring is compressed by 1.00 cm and the total stored potential energy is 0.00694 J, you can use the following equation:

k = 2E/x2

Where E is the stored potential energy, and

x is the displacement of the spring.

So, plugging in the given values:

k = (2 × 0.00694) / (1.00 cm)2

  = 0.00694 N/m or 6.94 kg/s2

for such more question on spring constant

https://brainly.com/question/23885190

#SPJ11