NEET UG PHYSICS MCQ: WORK-ENERGY-POWER

1 Hard

1 of 1

Application +4 | -1

A particle experiences a variable force

\vec{F}=\left(2 x^2 \hat{i}+2 y \hat{j}\right) N

in a horizontal

X-Y

plane. where

x

and

y

are in meters. If the particle moves from point

(0,1)

to point

(1,2)

in the

X-Y

plane, then kinetic energy charges by

View answer and explanation

Correct option: A

\frac{11}{3} \mathrm{~J}

Option A (

\frac{11}{3} \mathrm{~J}

) is correct because the change in kinetic energy is equal to the work done by the force, which is calculated by integrating the force along the path.

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{A}

ball is dropped on the ground from a height of

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. If the coefficient of restitution is 0.6 , the height to which the ball will rebound is A running man has the same kinetic energy as that of a boy of half his mass. The man speed up by

2\mathrm{\;m}{\mathrm{s}^{ - 1}}

and the boy changes his speed by

x = \mathrm{m}{\mathrm{s}^{ - 1}}

, so that the kinetic energies of the boy and the man are again equal. Then x in

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is A force

\mathrm{\vec F} = - K\left( {y\hat i + x\hat j} \right)

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\mathrm{\vec F}

on the particle is A motor is used to deliver water at a certain rate from a given pipe. To obtain 3 times water from same pipe in same time, by what factor should power of the motor be increased. A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest The speed limit of a car over a roadways bridge in the form of a vertical arc is

9.8\;\mathrm{m}{\mathrm{s}^{ - 1}}

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