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NEET UG PHYSICS MCQ: WORK-ENERGY-POWER

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One end of a light spring of spring constant

k

is fixed to a wall and the other end is tied to a block placed on a smooth horizontal surface. In a displacement, the work done by the spring is

(1 / 2) k x^2

. The possible cases are

View answer and explanation

Correct option: A

the spring was initially compressed by a distance

x

and was finally in its natural length

The spring was initially compressed by a distance

x

and was finally in its natural length. The work done by the spring is positive when it returns to its natural length from a compressed state.

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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}}

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

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

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

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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

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. The diameter of the are is