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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.
Related Questions: - The de-Broglie wavelength of a proton(charge = 1.6 x 10⁻¹⁹ C, Mass = 1.6 x 10⁻²⁷ kg)
- At 10⁰C the value of the density of a fixed mass of an ideal gas divided by its pressure
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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
- The de-Broglie wavelength of a proton(charge = 1.6 x 10⁻¹⁹ C, Mass = 1.6 x 10⁻²⁷ kg)
- At 10⁰C the value of the density of a fixed mass of an ideal gas divided by its pressure
- The coefficient of performance of a refrigerator is 5. If the temperature inside
- A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
- A transformer having efficiency of 90% is working on 200 V and 3kW power supply
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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