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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 mass of 2.0 kg is put on a flat plan attached to a vertical spring fixed on the ground
- The nuclear fusion reaction between deutrium and tritium takes place
- The wavelength of kα, X-rays produced by an X-ray tube 0.76Å. The atomic number
- A 200 W sodium street lamp emits yellow light of wavelength 0.6 µm
- A particle of mass M is executing oscillations about the origin on the x-axis.
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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