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Give an example where work done by a for...

Give an example where work done by a force is zero.

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when a body moves in a circular path no work is doen.In this casethe centripetal force acts at right angles to the direction of motion.
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BINA LIBRARY-WORK,ENERGY AND POWER-EXERCISE
  1. A man is swimming upstream over a river such that he appears to be at...

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  2. How much work is done on a body of mass m in moving it around a horizo...

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  3. Give an example where work done by a force is zero.

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  4. What is the power needed to maintain uniform circuler motion?

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  5. Can a body have energy without having momentum?

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  6. A ballon filled with hydrogen rises upward gaining both kinetic and po...

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  7. A man of mass 60 kg walks up to the top of a building of height 15 m....

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  8. A man cycles up a hill whoes slope is 1 m in 25 at the rate of 10 km/h...

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  9. A bullet of mass 12 g strikes a soild surface at a speed of 400m/s. It...

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  10. A body of mass 1kg falls from the top of a cliff 50 m high and buries...

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  11. A force of 1000 dynes acts on a particle of mass 500 g for 10seconds....

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  12. Calculate the power of a motor in kilo-watt ,which is capable of risin...

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  13. A pump lifts 20 kg of water in one minute to a vertical height of 30m....

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  14. Two bodies having masses 1g and 4g are moving with equal K.E find the ...

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  15. A 200 g ball falls from rest through air. If its speed is 10 m/s after...

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  16. A bullet of mass 100 g strikes a wooden plank with a velocity of 300ms...

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  17. A force of 100 dynes acts on a particle of mass 0.5 kg for 10 sec. Cal...

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  18. An engine lifts 200kg of metal to a vertical height of 30 m in one min...

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  19. A car of weight 1000 kg moves with a uniform speed of 36Km/hr up an ...

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  20. An engine of weight one metric ton is going up an inclined plane ,mak...

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