The ring shown in figure is given a constant horizontal acceleration ( a 0 = g 3 ) . The maximum deflection of the string from the vertical is θ 0 . Then

At maximum deflection, tension in string is equal to m g .

At maximum deflection, tension in string is equal to 2 m g 3 .

EASY

Earn 100

Fictitious force is also known as _____.

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Important Questions on Work, Energy and Power

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

Assertion $(A)$ : The work done by the electrostatic force is zero when a point charge moves in a circular path around another charge.

Reason $(R)$ : The dot product of force and displacement vectors gives work done.

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

2 kg

mass lying on a table is displaced in the horizontal direction through

50

cm .

The work done by the normal reaction will be

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

If reaction is $R$ and coefficient of friction $μ_{r}$ what is the work done against friction in moving a body by distance $d$ ?

Question Image

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

When a rubber string is stretched through a distance

x

, the restoring force developed has a magnitude

(p x + q x^{2} + r x^{3})

where

p, q

and

r

are constants. Work done in stretching the unstretched rubber string by a distance

l

, is

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

Two springs of spring constants

K

and

2 K

are stretched by same force. If

W_{1}

and

W_{2}

are the energies stored in them respectively then

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A force

F = 20 + 10 y

acts on a particle in

y

-direction where

F

is in Newton and

y

is in meter. Work done by this force to move the particle from

y = 0

y = 1 m

HARD

Science>Physics>Work, Energy and Power>Work Energy Theorem

A force

(F) = - 5 \hat{i} - 7 \hat{j} + 3 \hat{k}

acting on a particle causes a displacement

(s) = 3 \hat{i} + 2 \hat{j} + a \hat{k}

in its own direction. If the work done is

14 J

, then the value of

a

is:

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A particle moves from a point

(- 2 \hat{i} + 5 \hat{j})

(4 \hat{j} + 3 \hat{k})

when a force of

(4 \hat{i} + 3 \hat{j}) N

is applied. How much work has been done by the force?

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

If a particle is compelled to move on a given smooth plane curve under the action of given forces in the plane

\vec{F} = x \hat{i} + y \hat{j}

, then

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A bullet of mass

m

fired at

30 °

to the horizontal leaves the barrel of the gun with a velocity

v

. Then bullet hits a soft target at a height

h

above the ground. While it is moving downward it hits the target and emerges out with half the kinetic energy it had before hitting the target. Which of the following statements is correct with respect to the bullet after it emerges out of the target?

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

The relationship between the force

F

and position

x

of a body is as shown in figure. The work done in displacing the body from

x = 1 m to x = 5 m

will be-

HARD

Science>Physics>Work, Energy and Power>Work Energy Theorem

The ring shown in figure is given a constant horizontal acceleration

(a_{0} = \frac{g}{\sqrt{3}})

. The maximum deflection of the string from the vertical is

θ_{0}

. Then

MEDIUM

Science>Physics>Work, Energy and Power>Work Energy Theorem

A raindrop of mass

1 g

falling from a height of

1 km

hits the ground with a speed of

50 m s^{- 1}

. If the resistive force is proportional to the speed of the drop, then the work done by the resistive force is

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

MEDIUM

Science>Physics>Work, Energy and Power>Work Energy Theorem

The force exerted by a compression device is given by

F (x) = k x (x - l)

for

0 < x < l

, where

l

is the maximum possible compression,

x

is the compression and

k

is a constant. The work required to compress the device by a distance

d

will be maximum when:

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A ball is dropped from a height of

20 c m

. Ball rebound to a height of

10 c m

. What is the loss of energy?

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A person draws water from a

5 m

deep well in a bucket of mass

2 kg

of capacity

8 litre

by a rope of mass

1 kg

. What is the total work done by the person?

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

MEDIUM

Science>Physics>Work, Energy and Power>Work Energy Theorem

A certain force acting on a

20 kg

mass changes its velocity from

5 {ms}^{- 1}

2 {ms}^{- 1}

. Calculate the work done by the force.

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

According to work-energy theorem, the work done by the net force on a particle is equal to the change in its

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

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

MEDIUM

Science>Physics>Work, Energy and Power>Work Energy Theorem

The work done by a pseudo force is _____.

Fictitious force is also known as _____.

Important Questions on Work, Energy and Power

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