An engine pulls a car of mass 1500kg on a level road at constant speed of 5m/s.If the frictional force is 500N,what power does the engine generate?
1,5.0KW
2,7.5KW
3,10KW
4,12.5KW

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Solution

Since the car moves at a constant speed,its acceleration is zero. Hence the engine has to do work only to overcome the frictional force.
Here distance moved in one sec=v metres.
The work done per second=power P=Fxv=500x5=2500
W=2.5kW

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An engine pull a 1500kg of car on a level road at a constant speed of 5m/s against a frictional force of 500N. Calculate the power expended by the engine. What extra power has the engine to expend in order to maintain the same speed of the car up an inclined plane having a gradient of 1in 10?

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1500

kg car on a level road at a constant speed of

5.0

s^{- 1}

against a frictional force of

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Q. Question 22
An automobile engine propels a 1000 kg car (A) along a leveled road at a speed of 36 kmph. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of same mass and comes to rest. Let its engine also stop at the same time. Now car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.

Q. An automobile engine propels a 1000 kg car (A) along a leveled road at a speed of

36 k m h^{- 1}

. Find the power if the opposing frictional force is 100 N.
Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of same mass and comes to rest. Let its engine also stop at the same time. Now car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.

Q. Question 22
An automobile engine propels a 1000 kg car (A) along a leveled road at a speed of 36 kmph. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of same mass and comes to rest. Let its engine also stop at the same time. Now car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.

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An engine pulls a car of mass 1500kg on a level road at constant speed of 5m/s.If the frictional force is 500N,what power does the engine generate?1,5.0KW2,7.5KW3,10KW4,12.5KW

Since the car moves at a constant speed,its acceleration is zero. Hence the engine has to do work only to overcome the frictional force.Here distance moved in one sec=v metres.The work done per second=power P=Fxv=500x5=2500W=2.5kW

An engine pulls a car of mass 1500kg on a level road at constant speed of 5m/s.If the frictional force is 500N,what power does the engine generate?
1,5.0KW
2,7.5KW
3,10KW
4,12.5KW

Since the car moves at a constant speed,its acceleration is zero. Hence the engine has to do work only to overcome the frictional force.
Here distance moved in one sec=v metres.
The work done per second=power P=Fxv=500x5=2500
W=2.5kW