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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
Options
(a) at the highest position of the body
(b) at the instant just before the body hits the earth
(c) it remains constant all through
(d) at the instant just after the body is projected
Correct Answer:
at the instant just before the body hits the earth
Explanation:
Power exerted by a force is given by P = F.v. When the body is just above the earth’s surface, its velocity is greatest. At this instant, gravitational force is also maximum. Hence, the power exerted by the gravitational force is greatest at the instant just before the body hits the earth.
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Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A particle moves along the x-axis such that its co-ordinate (x) varies with time (t)
- Length of second pendulum is
- Solar radiation is
- A series L-C-R circuit contains inductance 5 mH, capacitance 2 μF and resistance
- If a star converts all helium in its core to oxygen, then energy released per oxygen
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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