Chapter 8
GRAVITATION
1. What would happen to the duration of the year if the distance between the earth and the sun gets doubled
Ans:- 2.828
2. The dimensional formula for gravitation constant is
Ans:- M -2 L 3 T -2
3. The kinetic energy of a satellite is 2M joules what is the total energy?
Ans:- -2M Joules
4. The orbital velocity of a satellite at hight
r from the centre if earth is v. What will be the value of the escape velocity from the Same location ?
Ans:- 1.414 Vo
5. A body dropped from a satellite moved towards the surface of earth . State whether this statement true or False
Ans:- False. A body dropped from a satellite moves along with the satellite
6. Work done to shift 1 kg of mass from the surface of earth to infinity is
Ans:- gR
7. A mass m is placed at centre of allow sphere of mass M and radius R .what is the gravitational force of mass m
Ans:- zero
8. The density of earth is doubled keeping its radius constant . The acceleration due to gravity will be
Ans:- 1.96 m/s 2
9. If the mass of the body on the moon 13 denoted by M m and that on the earth by Me,then Mm=....................
Ans:- Mm=Me
10. A satellite is moved out into orbit of larger radius. With of the following quantities associated with increases
Ans:- potential energy
11. State kelper 's law which you made use of there
Ans:- law of period- square of the time period of revaluation of a plant is proportional to the cube of semi - major axis of the ellipse . Traced by the plant
12. Velocity required for a satellite to remain in a particular orbit is called
Ans:- orbital velocity
13. Prove that total energy of n orbit satellite is equal to it is kinetic energy is magnitude
Ans:- total energy = KE+ PE = 1/2 mv2
GMm/r
V2=GM/r;so E=1/2GMm/r GMm/r
=-1/2GMm/r
E=-1/2GMm/r and K.E=1/2GMm/r
14.If satellite goes on lossing energy due to friction how will its orbital speed and motion be affected
Ans:- Satellite comes closer to the earth with increasing speed
GRAVITATION
1. What would happen to the duration of the year if the distance between the earth and the sun gets doubled
Ans:- 2.828
2. The dimensional formula for gravitation constant is
Ans:- M -2 L 3 T -2
3. The kinetic energy of a satellite is 2M joules what is the total energy?
Ans:- -2M Joules
4. The orbital velocity of a satellite at hight
r from the centre if earth is v. What will be the value of the escape velocity from the Same location ?
Ans:- 1.414 Vo
5. A body dropped from a satellite moved towards the surface of earth . State whether this statement true or False
Ans:- False. A body dropped from a satellite moves along with the satellite
6. Work done to shift 1 kg of mass from the surface of earth to infinity is
Ans:- gR
7. A mass m is placed at centre of allow sphere of mass M and radius R .what is the gravitational force of mass m
Ans:- zero
8. The density of earth is doubled keeping its radius constant . The acceleration due to gravity will be
Ans:- 1.96 m/s 2
9. If the mass of the body on the moon 13 denoted by M m and that on the earth by Me,then Mm=....................
Ans:- Mm=Me
10. A satellite is moved out into orbit of larger radius. With of the following quantities associated with increases
Ans:- potential energy
11. State kelper 's law which you made use of there
Ans:- law of period- square of the time period of revaluation of a plant is proportional to the cube of semi - major axis of the ellipse . Traced by the plant
12. Velocity required for a satellite to remain in a particular orbit is called
Ans:- orbital velocity
13. Prove that total energy of n orbit satellite is equal to it is kinetic energy is magnitude
Ans:- total energy = KE+ PE = 1/2 mv2
GMm/r
V2=GM/r;so E=1/2GMm/r GMm/r
=-1/2GMm/r
E=-1/2GMm/r and K.E=1/2GMm/r
14.If satellite goes on lossing energy due to friction how will its orbital speed and motion be affected
Ans:- Satellite comes closer to the earth with increasing speed
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