Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 76

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A boy is sitting on a swing at a maximum height of $5 m$ above the ground. When the swing passes through the mean position which is $2 m$ above the ground its velocity is approximately-

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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 77

A force of

10 N

acts on a body of

2 kg

mass for a distance of

1 m

. The kinetic energy received by the body is-

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 78

Two springs of spring constant $1500 N m^{- 1}$ and $3000 N m^{- 1}$ respectively are stretched with the same force. The potential energies will be in the ratio of

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 79

The kinetic energy

K

of a particle moving in a straight line depends upon the distance s as

K = a s^{2}

The force acting on the particle is-

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 80

If a spring extends by

x

on loading, then the energy stored by the spring is (if

T

is tension in the spring and

k

is spring constant)

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 81

The elastic potential energy of a spring-

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 82

The amount of work done in stretching a spring from a stretched length of

10 cm

to a stretched length of

20 cm

is-

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 83

A block of mass

2 kg

collides with a horizontal weightless spring fixed at one end and of force constant

2 N m^{- 1}

. The block compresses the spring by

4

meter from the rest position. The speed of the block at the instant of collision is-

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 84

An ideal massless spring

S

can be compressed

2

metre by a force of

200 N .

This spring is placed at the bottom of the frictionless inclined plane with makes an angle

θ = 30 °

with the horizontal: A

20 kg

mass is released from rest at the top of the inclined plane and is brought to rest momentarily after compressing the spring

4

metre. Through what distance does the mass slide before coming to rest-

(g = 10 m s^{- 2})