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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
- An electric charge 10⁻³ μC is placed at the origin (0,0) of X-Y co-ordinate system.
- When the wavelength of sound changes from 1 m to 1.01 m,
- A mass m moving horizontally (along the x-axis) with velocity v collides and sticks
- A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
- The equiconvex lens has focal length f. If it is cut perpendicular to the principal
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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