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The kinetic energy needed to project a body of mass m from the surface of earth (radius R) to infinity is
Options
(a) mgR/2
(b) 2mgR
(c) mgR
(d) mgR/4
Correct Answer:
mgR
Explanation:
The kinetic energy =1/2MVe²
The escape velocity Ve=√2gR
Ve²=2gR
= 2mgR/2
=mgR
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Topics: Gravitation
(63)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is dropped from a height 100
- The momentum of a body is increased by 20%.The percentage increases in kinetic energy
- A charge Q is uniformly distributed over a large plastic plate. The electric field
- The number of photo electrons emitted for light of a frequency v
- If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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