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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: - Consider the following two statements about Kirchhoff’s law
- The ratio of the acceleration for a solid sphere(mass m and radius R)rolling down
- A disc of mass 100 g is kept floating horizontally in air by firing bullets
- In an orbital motion, the angular momentum vector is
- Two radiations of photons energies 1 eV and 2.5 eV, successively
Topics: Gravitation
(63)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Consider the following two statements about Kirchhoff’s law
- The ratio of the acceleration for a solid sphere(mass m and radius R)rolling down
- A disc of mass 100 g is kept floating horizontally in air by firing bullets
- In an orbital motion, the angular momentum vector is
- Two radiations of photons energies 1 eV and 2.5 eV, successively
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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