Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 49

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A particle of mass $0.1 kg$ is subjected to a force which varies with distance as shown in figure. If it starts its journey from rest at $x = 0 m,$ its velocity at $x = 12 m$ 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 50

A heavy stone is thrown from a cliff of height

h

with a speed

v

. The stone will hit the ground with maximum speed if it is thrown

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 51

The work done by all the forces (external and internal) on a system equals the change in

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 52

A body starts from rest with uniform acceleration and acquires a velocity

V

in time

T .

The instantaneous kinetic energy of the body after any time

t

is proportional to:

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 53

The total work done on a particle is equal to the change in its kinetic energy

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 54

When a man walks on a horizontal surface with constant velocity, work done by

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 55

Given that the displacement of the body in metre is a function of time as follows

x = 2 t^{4} + 5 .

The mass of the body is

2 kg .

What is the increase in its kinetic energy one second after the start of motion?

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 56

A force $F$ acting on an object varies with distance $x$ as shown here. The force is in $N$ and $x$ is in $m .$ The work done by the force in moving the object from $x = 0$ to $x = 6 m$ is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 57

The potential energy of a long spring when stretched by

2 cm

is

U

. If the spring is stretched by

8 cm

the potential energy stored in it is