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A man is riding on a cycle with velocity 7.2 km h-1 up a hill having a slope 1 in 20. The total mass of the man and cycle is 100 kg. The power of the man is

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Important Questions on Work, Energy and Power

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 110
A body of mass m kg initially at rest attains a velocity of v m sec-1 in time t under the action of a constant force F. The power supplied to the mass is-
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 111
An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that the efficiency of the engine is 60%. If g=10 m s–2, the power of this engine is:
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 112
A kilowatt hour is equal to
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 113
An engine exerts a force F→=20i^-3j^+5k^ N and moves with velocity v→=6i^+20j^-3k^ m s-1. The power of the engine (in watt) is :
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 114
The average power required to lift a 100 kg mass through a height of 50 metres in approximately 50 seconds would be take g=9.8 m s-2.
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 115
A block of mass m is moving with a constant acceleration a on a rough horizontal plane. If the coefficient of friction between the block and plane is μ.The power delivered by the external agent at a time t from the beginning is equal to :
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 116
A particle moves with a velocity v→=(5i^-3j^+6k^) m s-1 under the influence of a constant force F→=10i^+10j^+20k^ N. The instantaneous power applied to the particle is:
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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 117
A man M1 of mass 80 kg runs up a staircase in 15 s. Another man M2 also of mass 80 kg runs up the staircase in 20 s. The ratio of the power developed by them P1/P2 will be: