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Engine of a car of mass 1500kg, keeps ca...

Engine of a car of mass 1500kg, keeps car moving with constant velocity `5ms^(-1)`. If frictional force is 1000 N, power of engine is …………..

A

`5kW`

B

`7.5kW`

C

`15kW`

D

`75kW`

Text Solution

Verified by Experts

`v=5ms^(-1),m=1500kg,F=1000N`
`W=Fxxs`
`therefore P=(W)/(t)=(Fxxs)/(t)=Fxxv(because v=(s)/(t))`
`thereforeP=(1000N)xx(5ms^(-1))=5000W`
`P=5kW`
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KUMAR PRAKASHAN-WORK AND ENERGY -QUESTION & ANSWER (CHOOSE THE CORRECT OPTION FROM THOSE GIVEN BELOW EACH QUESTION)
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  2. Masses of two bodies are 1kg and 4kg respectively. If their kinetic en...

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  3. Engine of a car of mass 1500kg, keeps car moving with constant velocit...

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  4. Height of water dam in hydroelectric power station is 20m. How much wa...

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  5. Speed of a body in motion is doubled. Its kinetic energy is now …………. ...

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  6. An object is thrown vertically upwards with velocity of 20ms^(-1). At ...

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  7. 1kWh=

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  8. When spring is compressed its potential energy ………..

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  9. What is the unit of work in the SI system of unit?

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  10. What is power?

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  11. A person of mass 55kg pushesh a wall. Work done by this person …………..

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  12. In momentum of the object having mass 4kg is 20kgms^(-1), what would b...

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  13. An object of mass 2kg is thrown in the upward direction with velocity ...

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  14. The kinetic energy of the object

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  15. An object of mass 100g moves with speed 1ms^(-1). Its kinetic energy w...

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  16. When the speed of a car moving with accelerated motion on a horizontal...

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  17. A bullet of mass 20g fired from a rifle is found to cover the distance...

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  18. A body is thrown up with a kinetic energy of 10 J. If it attains maxim...

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  19. If an object is falling freely from certain height towards the surface...

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  20. The work done on the object is negative, then the measure of angle bet...

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