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If R is the radius of the earth and g is the acceleration due to gravity on the earth surface, the mean density of the earth is
Options
(a) 4πG/3gR
(b) 3πG/4gR
(c) 3g/4πRG
(d)πRg/12G
Correct Answer:
3g/4πRG
Explanation:
Density = Mass/ Volume
= M / (4/3 π R³)
= (gR² / G). x 3/4 (1/π R³) [as g = GM/R²]
= (3/4π G) x (g/R)
=3g/4πRG
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Question Type: Apply
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Difficulty Level: Easy
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Topics: Gravitation
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If the ionisation energy for the hydrogen atom is 13.6 eV, the energy required
- If a proton, a deuteron and an alpha particle, on being accelerated by the same
- When temperature of an ideal gas is increased from 27⁰C to 227⁰C,
- A body is thrown with a velocity of 9.8 m/s making angle of 30° with the horizontal
- If oxygen has root mean square velocity of C m/s, then root mean square velocity of H
Question Type: Apply (15)
Difficulty Level: Easy (1008)
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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