| ⇦ | 
| ⇨ |
If the density of earth is doubled keeping its radius constant then acceleration due to gravity will be (g=9.8 m/s²)
Options
(a) 19.6 m/s²
(b) 9.8 m/s²
(c) 4.9 m/s²
(d) 2.45 m/s²
Correct Answer:
19.6 m/s²
Explanation:
Acceleration due to gravity g=GM/R² ——-(1)
The radius is constant, volume also constant.
If volume is constant, density is proportional to mass.(v=m/ρ)
The density is doubled, the mass is also doubled. (M’=2M)
The new acceleration due to gravity g’=GM’/R’²
Put the value M’=2M and R’=R
g’=G(2M)/R²
g’=2GM/R² ——–(2)
Substituting equations (1) and (2), we get
g’=2g
g=9.8 m/s²
g’=2×9.8=19.6 m/s²
Related Questions: - Aperture of human eye is 0.2 cm. The minimum magnifying power of a visual
- A 220 volt and 1000 watt bulb is connected across a 110 volt mains supply.
- At absolute temperature, the kinetic energy of the molecules
- A geostationary satellite is orbiting the earth at a height of 5R above that surface
- Electrons used in an electron microscope are accelerated by a voltage of 25 kV
Topics: Gravitation
(63)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Aperture of human eye is 0.2 cm. The minimum magnifying power of a visual
- A 220 volt and 1000 watt bulb is connected across a 110 volt mains supply.
- At absolute temperature, the kinetic energy of the molecules
- A geostationary satellite is orbiting the earth at a height of 5R above that surface
- Electrons used in an electron microscope are accelerated by a voltage of 25 kV
Topics: Gravitation (63)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply