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NEET UG PHYSICS MCQ: WORK-ENERGY-POWER

1 Easy

1 of 1

Application +4 | -1

If two persons

A

and

B

takes 2 seconds and 4 seconds respectively to lift an object to the same height

h

then ratio of their power is

View answer and explanation

Correct option: C

0.084027778

The correct answer is C (0.084027778) because power is inversely proportional to time when work done is constant.

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

\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}}

. The diameter of the are is