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One coolie takes 1min to raise a box thr...

One coolie takes 1min to raise a box through a height of `2m`. Another one takes `30s` for the same job and does the same amount of work. Which one of the two has greater power and which one uses greater enegy?

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SL ARORA-Work, Energy and power-EXERCISE
  1. A lift is designed to carry a load of 4000kg through 10 floors of a bu...

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  2. A machine can take out 1000 kg of mud hour from a dept of 100 m . If ...

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  3. One coolie takes 1min to raise a box through a height of 2m. Another o...

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  4. An energies of 4.9 K.W power is used to pump water from a well 50 m d...

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  5. Water is pumped out of a well 10 m deep by mean of a pump rated at 10 ...

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  6. A 30m deep well is having water up to 15 m. An engine evacuates it in ...

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  7. The human heart forces 4000cm^(3) of blood per minute through the arte...

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  8. A car of mass 1000kg accelerates uniformly from rest to a velocity of ...

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  9. A car of mass 1000kg accelerates uniformly from rest to a velocity of ...

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  10. A car of mass 1000 kg accelerrates uniformly from rest to a velocity o...

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  11. A vehicle of mass 30 quintals moving with a speed of 18km h^(-1) coll...

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  12. A body of mass 2 kg makes an elastic collision with another body at re...

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  13. Ball A of mass m strickes a stationary ball B of mass M and undergoes ...

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  14. Two particles of masses 0.5 kg and 0.25kg moving with velocity 4.0 m//...

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  15. Two particles of masses 0.5 kg and 0.25kg moving with velocity 4.0 m//...

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  16. What percentage of the K.E. of a moving particle is transferred to a s...

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  17. A neutron moving with a speed of 10^6 ms^(-1) suffers a head - on coll...

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  18. What percentage of K.E. of a moving particle is transferred to a stati...

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  19. What percentage of K.E. of a moving particle is transferred to a stati...

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  20. What percentage of K.E. of a moving particle is transferred to a stati...

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