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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 pure semiconductor behaves slightly as a conductor at
- A machine gun fires 10 bullets/s,each of mass 10 g,the speed of each bullet
- Two bodies A and B have masses 20 Kg and 5 Kg respectively. Each one is acted
- Light with an energy flux of 25×10⁴ Wm⁻² falls on a perfectly reflecting surface
- The identical cells connected in series are needed to heat a wire of length one meter
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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