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A boy of mass 50 kg jumps to a height of 0.8 m from the ground then momentum transferred by the ground to boy is :

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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 (Previous Year Questions)>Q 18

A body of mass 1 kg begins to move 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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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Previous Year Questions)>Q 19

A particle moves from a point

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

(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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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Previous Year Questions)>Q 20

Consider a drop of rain water having mass

1 g

falling from a height of

1 k m .

It hits the ground with a speed of

50 m / s .

Takes

g

constant with a value of

10 m / s^{2}

. The work done by the

(i)

Gravitational force and the

(i i)

resistive force of air is

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

A block of mass 20 kg is moved with constant velocity along an inclined plane of inclination 37° with help of a force of constant power 50W. If the coefficient of kinetic friction between block and surface is 0.25, then what fraction of power is used against gravity?

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

Velocity of a particle of mass 1 kg moving rectilinearly is given by v = 25 – 2t + t². Find the average power of the force acting on the particle between time interval t = 0 to t = 1 sec.

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

A particle of mass

10 g

moves along a circle of radius

6.4 cm

with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to

8 \times 10^{- 4} J

by the end of the second revolution after the beginning of the motion ?

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

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

R

so that it can complete the loop?

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

Two particles of masses

m_{1}, m_{2}

move with initial velocities

u_{1}

and

u_{2}

. On collision, one of the particles get excited to higher level after absorbing energy

ε

. If final velocities of particles be

v_{1}

and

v_{2}

, then we must have,

A boy of mass 50 kg jumps to a height of 0.8 m from the ground then momentum transferred by the ground to boy is :

Important Questions on Work, Energy and Power

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