NEET UG PHYSICS MCQ: WORK-ENERGY-POWER

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A man pushes a wall and falls to displace it. He does

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Correct option: C

No work at all

Option C (No work at all) is correct because work is defined as force times displacement, and if the wall doesn't move, there is no displacement, hence no work is done.

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{A}

ball is dropped on the ground from a height of

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

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

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is A force

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

(where K is a positive constant) acts on a particle moving in the x-y plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a,0) and then parallel to the y-axis to the (a,a). The total work done by the force

\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}}

. The diameter of the are is