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JEE Advanced

IMPORTANT

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A spring is compressed between two toy carts of masses $m_{1}$ and $m_{2}$ . When the toy carts are released, the spring exerts an equal and opposite force on each toy cart for a same small time $t$ . If the coefficient of friction between the ground and the toy carts is $μ$ , then the magnitude of displacements of the toy carts are in the ratio:

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Important Questions on Work, Energy and Power

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JEE Advanced

IMPORTANT

PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 16

The displacement

x

in meter of a particle of mass

m kg

moving in one dimension under the action of a force is related to the time

t

in second by the equation

x = {(t - 3)}^{2} .

The work done by the force (in joules) in first six seconds is

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JEE Advanced

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 17

A mass

M

is lowered with the help of a string by a distance

h

at a constant acceleration

\frac{g}{2}

. The work done by the string will be

EASY

JEE Advanced

IMPORTANT

PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 18

A bus can be stopped by applying a retarding force

F

when it is moving with speed

v

on a level road. The distance covered by it before coming to rest is

s

. If the load of the bus increases by

50 %

because of passengers, for the same speed and same retarding force, the distance covered by the bus to come to rest shall be

EASY

JEE Advanced

IMPORTANT

PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 19

The velocity-time graph of a particle moving in a straight line is shown in figure. The mass of the particle is $2 kg$ . Work done by all the forces acting on the particle in time interval between $t = 0$ to $t = 10 s$ is

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JEE Advanced

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 20

A pump motor is used to deliver water at a certain rate from a given pipe. To obtain

n

times water from the same pipe in the same time, by what amount should the power of the motor be increased?

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JEE Advanced

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 21

The speed

v

reached by a car of mass

m

in travelling a distance

x

, driven with constant power

P

, is given by

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JEE Advanced

IMPORTANT

PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 22

Power supplied to a particle of mass

2 kg

varies with time as

P = \frac{3 t^{2}}{2} W

. Here

t

is in second. If the velocity of particle at

t = 0

v = 0,

the velocity of particle at time

t = 2 s

will be

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JEE Advanced

IMPORTANT

PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 23

A body is moved along a straight line by a machine delivering a constant power. The distance moved by the body in time

t

is proportional to

Important Questions on Work, Energy and Power

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