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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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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In an inductor when current changes from 2 A to 18 A in 0.05 sec, the e.m.f. induced
- Cathode rays are produced when the pressure is of the order of
- The ionisation potential of hydrogen-atom is -13.6 eV. An electron in the groundstate
- Which of the following is true for number of spectral lines in going from Lyman series
- If the length of a closed organ pipe is 1.5 m and velocity of sound is 330 m/s,
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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