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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
Related Questions: - A beam of electron passes undeflected through mutually perpendicular
- Light emitted during the de excitation of electron from n=3 to n=2, when incident
- Two identical long conducting wires AOB and COD are placed at right angle
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Topics: Gravitation
(63)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A beam of electron passes undeflected through mutually perpendicular
- Light emitted during the de excitation of electron from n=3 to n=2, when incident
- Two identical long conducting wires AOB and COD are placed at right angle
- A linear aperture whose width is 0.02 cm is placed immediately in front of a lens
- A photosensitive metallic surface has work function, hν₀. If photons of energy
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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