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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
(15)
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
- The excess pressure inside one soap bubble is three times that inside a second soap bubble
- If the ionisation energy for the hydrogen atom is 13.6 eV, the energy required
- A charged particle enters a uniform magnetic field with a certain speed at right angles
- The acceleration due to gravity at a place is π² m/sec². Then the time period
- A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature
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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