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NEET UG PHYSICS MCQ: WORK-ENERGY-POWER

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Assertion(A): Force applied on a block moving in one dimension is producing a constant power, then the motion should be uniformly accelerated.

Reason(R): This constant power multiplied with time is equal to the change in kinetic energy.

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Correct option: D

If Assertion is incorrect but Reason is correct.

Option D is correct. The assertion is incorrect because constant power does not imply uniform acceleration. The reason is correct because power multiplied by time equals the change in kinetic energy.

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

\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