A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break, when

the mass is at the lowest point

the mass is at the highest point

inclined at an angle of 60 ° from vertical

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Two identical balls $A$ and $B$ having velocities of $0.5 m s^{- 1}$ and $- 0.3 m s^{- 1}$ , respectively, collide elastically in one dimension. The velocities of $B$ and $A$ after the collision, respectively, will be

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Important Questions on Work, Energy and Power

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NEET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>NEET - 24th July 2016>Q 13

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?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>NEET - 1st May 2016>Q 14

What is the minimum velocity with which a body of mass m must enter a vertical loop of radius

R

so that it can complete the loop?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>NEET - 1st May 2016>Q 15

A body of mass

1 kg

begins to move from rest under the action of a time dependent force

\vec{F} = (2 t \hat{i} + 3 t^{2} \hat{j}) N

, where

\hat{i}

and

\hat{j}

are unit vectors along x and y axis. What power will be developed by the force at the time t?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>AIPMT - 3rd May 2015>Q 16

Two similar springs

P

and

Q

have spring constants

K_{P}

and

K_{Q}

, such that

K_{P} > K_{Q}

. They are stretched, first by the same amount (case a), then by the same force (case b). the work done by the springs

W_{P}

and

W_{Q}

are related as respectively, in case

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>AIPMT - 3rd May 2015>Q 17

A block of mass

10 kg

, moving in

x

direction with a constant speed of

10 m s^{- 1}

, is subjected to a retarding force

F = [(0 .1) x] J m^{- 1}

during its travel from

x = 20 m

30 m

. Its final kinetic energy will be:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>AIPMT - 3rd May 2015>Q 18

A particle of mass

m

is driven by a machine that delivers a constant power

k

watts. If the particle starts from rest the force on the particle at time

t

is:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>AIPMT - 25th July 2015>Q 19

On a frictionless surfaces, a block of mass

M

moving at speed

v

collides elastically with another block of same mass

M

which is initially at rest. After collision the first block moves at an angle

θ

to its initial direction and has a speed

\frac{v}{3}

. The second block's speed after the collision is:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 4 - Work, Energy and Power>AIPMT - 25th July 2015>Q 20

A ball is thrown vertically downwards from a height of

20 m

with an initial velocity

v_{0}

. It collides with the ground, loses

50

percent of its energy in collision and rebounds to the same height. The initial velocity

v_{0}

is: (Take

g = 10 m s^{- 2}

)

Two identical balls A and B having velocities of 0.5 m s-1 and -0.3 m s-1, respectively, collide elastically in one dimension. The velocities of B and A after the collision, respectively, will be

Important Questions on Work, Energy and Power

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Two identical balls $A$ and $B$ having velocities of $0.5 m s^{- 1}$ and $- 0.3 m s^{- 1}$ , respectively, collide elastically in one dimension. The velocities of $B$ and $A$ after the collision, respectively, will be