Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 17

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Figure gives the acceleration of a $2.0 kg$ body as it moves from rest along $x -$ axis while a variable force acts on it from $x = 0 m$ to $x = 9 m$ . The work done by the force on the body when it reaches
(i) $x = 4 m$ and
(ii) $x = 7 m$ shall be as given below.

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Important Questions on Work, Energy and Power

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 18

A force acts on a

3 gm

particle in such a way that the position of the particle as a function of time is given by

x = 3 t - 4 t^{2} + t^{3},

where

x

is meters and

t

is in seconds. The work done during the first

4

second is

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 19

A constant force

F

is applied to a body of mass

m

moving with initial velocity

u

. If after the body undergoes a displacement

S

, its velocity becomes

v

, then the total work done is,

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 21

The graph between kinetic energy

E_{K}

and velocity

V

is

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 22

Velocity-time graph of a particle of mays $2 kg$ moving in a straight line is as shown in figure. Work done by all the forces on the particle is

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 23

The kinetic energy of a body becomes four times its initial value. The new momentum will be.

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 24

A

0 \cdot 5 kg

ball is thrown up with an initial speed

14 m / s

and reaches a maximum height of

8 \cdot 0 m .

How much energy is dissipated by the air drag acting on the ball during ascent?

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 25

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

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 26

Two bodies of mass

1 k g

and

4 k g

have equal

K . E .

then ratio of their momentum is