Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 25

EASY

NDA & NA EE

IMPORTANT

Earn 100

Assertion : Potential energy is possible only in conservative force field.
Reason : Potential energy is a relative quantity but K.E. is an absolute quantity.

30% studentsanswered this correctly

Important Questions on Work, Energy and Power

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 3

A man pulls a bucket out of a well using a rope. The work done by the man is____.

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 26

Assertion : A particle moving one dimensionally in conservative field may have more than one turning points.
Reason : Turning point depends on initial velocity.

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 27

A body of mass

6 kg

is acted upon by a force which causes a displacement in it given by

x = \frac{t^{2}}{4}

metre, where

t

is the time in second. The work done by the force is

2

seconds is

MEDIUM

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 28

The potential energy of a spring, when stretched through

10 cm

is

5 J

. The work done to stretch the spring through an additional distance of

10 cm

is

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 29

A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time ' $t$ ' is proportional to

MEDIUM

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 30

A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time $t$ is proportional to

HARD

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 31

A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time $t$ is proportional to

EASY

NDA & NA EE

IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 2

A weight lifter is holding a weight of

80 kg

on his shoulder for

10 s

. Work done by the lifter is