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IMPORTANT

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A small ball of mass $m$ is thrown upward with velocity $u$ from the ground. The ball experiences a resistive force $m k v^{2}$ where $v$ is its speed. The maximum height attained by the ball is :

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Important Questions on Work, Energy and Power

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>JEE Main - 4 September 2020 Shift 2>Q 45

A person pushes a box on a rough horizontal platform surface. He applies a force of

200 N

over a distance of

15 m

. Thereafter, he gets progressively tired and his applied force reduces linearly with distance to

100 N

. The total distance through which the box has been moved is

30 m

. What is the work done by the person during the total movement of the box?

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>JEE Main - 5 September 2020 Shift 1>Q 46

A bullet of mass

5 g

, travelling with a speed of

210 m s^{- 1}

strikes a fixed wooden target. One half of its kinetic energy is converted into heat in the wood. The rise of temperature of the bullet if the specific heat of its material is

0.030 {(g ° C)}^{- 1} (1 calorie = 4 .2 \times 10^{7} ergs)

close to :

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>JEE Main - 5 September 2020 Shift 2>Q 47

A body of mass

2 kg

is driven by an engine delivering a constant power of

1 J s^{- 1}

. the body starts from rest and moves in a straight line. After

9 s

, the body has moved a distance (in

m

)….

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JEE Main

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>JEE Main - 6 September 2020 Shift 1>Q 48

If the potential energy between two molecules is given by

U = \frac{A}{r^{6}} - \frac{B}{r^{12}},

then at equilibrium, separation between molecules, and the potential energy are:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>JEE Main - 6 September 2020 Shift 1>Q 49

Two bodies of the same mass are moving with the same speed, but in different directions in a plane. They have a completely inelastic collision and move together thereafter with a final speed which is half of their initial velocities of the two bodies (in degree) is -

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>JEE Main - 6 September 2020 Shift 2>Q 50

Particle

A

of mass

m_{1}

moving with velocity

(\sqrt{3} \hat{i} + \hat{j}) {ms}^{- 1}

collides with another particle

B

of mass

m_{2}

which is at rest initially. Let

{\vec{v}}_{1}

and

{\vec{v}}_{2}

be the velocities of particles

A

and

B

after collision respectively. If

m_{1} = 2 m_{2}

and after collision

{\vec{v}}_{1} - (\hat{i} + \sqrt{3} \hat{j}) {ms}^{- 1}

, the angle between

{\vec{v}}_{1}

and

{\vec{v}}_{2}

is :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>JEE Main - 7th January 2020 Shift 1>Q 51

A particle

(m = 1 k g)

slides down a frictionless track

(A O C)

starting from rest at a point

A

(height

2 m

). After reaching

C,

the particle continues to move freely in air as a projectile. When it reaches its highest point

P

(height

1 m

), the kinetic energy of the particle (in

J

) is: (Figure drawn is schematic and not to scale; take

g = 10 m s^{- 2}

) ______________.
Question Image

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>JEE Main - 8th January 2020 Shift 1>Q 52

A body

A

of mass

m = 0.1 k g

has an initial velocity of

3 \hat{i} m s^{- 1}

. It collides elastically with another body

B

of the same mass which has an initial velocity of

5 \hat{j} m s^{- 1}

. After the collision,

A

moves with a velocity

\vec{v} = 4 (\hat{i} + \hat{j}) m s^{- 1}

. The energy of

B

after the collision is written as

\frac{x}{10} J

. The value of

x

A small ball of mass m is thrown upward with velocity u from the ground. The ball experiences a resistive force mkv2 where v is its speed. The maximum height attained by the ball is :

Important Questions on Work, Energy and Power

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A small ball of mass $m$ is thrown upward with velocity $u$ from the ground. The ball experiences a resistive force $m k v^{2}$ where $v$ is its speed. The maximum height attained by the ball is :