Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 140

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A plank $P$ is placed on a solid cylinder $S$ , which rolls on a horizontal surface. The two are of equal mass. There is no slipping at any of the surfaces in contact. The ratio of the kinetic energy of $P$ to the kinetic energy of $S$ 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 141

The velocity of centre of mass of a disc rolling on an inclined plane changes from

V

to

2 V

at any instant of time. If

M

is the mass of disc then increases in its kinetic energy will be

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 142

A uniform thin ring of mass

0.4 kg

rolls without slipping on a horizontal surface with a linear velocity of

10 cm / s

. The kinetic energy of the ring is :

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 143

The velocity of simple pendulum is maximum at

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 144

Two springs with spring constants

K_{1} = 1500 N m^{- 1}

and

K_{2} = 3000 N m^{- 1}

are stretched by the same force. The ratio of potential energy stored in spring will be:

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 145

A uniform chain of length $2 m$ is kept on a table such that a length of $60 cm$ hangs freely from the edge of the table. The total mass of the chain is $4 kg$ . What is the work done in pulling the entire chain in the table?

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 146

The law of conservation of energy implies that the

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 147

If the kinetic energy of a body becomes four times of its initial value, then new momentum will

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 148

A ball of mass

2 kg

and another of mass

4 kg

are dropped together from a

60

feet tall building. After a fall of

30

feet each towards earth, their respective kinetic energies will be in the ratio of