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A body is projected from ground obliquely. During downward motion, power delivered by gravity to it

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Important Questions on Work, Energy and Power

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 38
The blades of a wind mill sweep out a circle of area A. If wind flows with velocity v perpendicular to blades of wind mill and its density is ρ, then the mechanical power received by wind mill is
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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 39
A body of mass m accelerates uniformly from rest to velocity v1 in time interval T1. The instantaneous power delivered to the body as a function of time t is
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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 40

The power of a pump, which can pump 500 kg, of water to height 100 m in 10 s is :

(1 kW = 1000 W).

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 41
A pump is used to pump a liquid of density ρ, continuously through a pipe of cross - section area A. If liquid is flowing with speed v, Then average power of pump is
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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 42
From a water fall, water is pouring down at the rate, of 100 kg s-1, on the blades of a turbine. If the height of the fall is 100 m, the power delivered to the turbine is approximately equal to
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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 43
A U-238 nucleus originally at rest, decays by emitting an α-particle, say with a velocity of v m s-1. The recoil velocity in m s-1 of the residual nucleus is
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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 44
An object of mass 80 kg moving with velocity 2 m s-1 hit by collides with another object of mass 20 kg moving with velocity 4 m s-1. Find the loss of energy assuming a perfectly inelastic collision
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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 45
A ball of mass m moving with velocity v collides head-on with the second ball of mass m at rest. If the coefficient of restitution is e and velocity of first ball after collision is v1 and velocity of second ball after collision is v2 then