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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 ray enters a glass sphere of refractive index μ=√3 at an angle of incidence of 60⁰
- A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped
- Find out the angle of projection, if range is 4 times of maximum height
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Topics: Gravitation
(63)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A ray enters a glass sphere of refractive index μ=√3 at an angle of incidence of 60⁰
- A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped
- Find out the angle of projection, if range is 4 times of maximum height
- When a ceiling fan is switched on, it makes 10 revolutions in the first 3s
- A tyre filled with air (27° C and 2 atm) bursts. The temperature of air is (ˠ=1.5)
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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