If the mass of a body is M on the earth surface, then the mass of the same body on the moon surface is:

(1)  M/6       

(2)  Zero

(3)  M          (4)   None of these

Subtopic:  Acceleration due to Gravity |
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Radius of orbit of satellite of earth is R. Its kinetic energy is proportional to -

1. 1R                      

2. 1R

3. R                         

4.  1R3/2

Subtopic:  Gravitational Potential Energy | Satellite |
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A particle falls towards earth from infinity. It’s velocity on reaching the earth would be -

(1)   Infinity                   

(2) 2gR

(3)   2gR                   

(4)  Zero

Subtopic:  Escape velocity |
 81%
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Two satellite A and B, ratio of masses 3 : 1 are in circular orbits of radii r and 4r. Then ratio of total mechanical energy of A to B is 

(1) 1 : 3                             

(2) 3 : 1

(3) 3 : 4                             

(4) 12 : 1

Subtopic:  Satellite |
 78%
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The orbital velocity of a planet revolving close to earth's surface is 

(1) 2gR              

(2) gR

(3) 2gR               

(4) gR  

Subtopic:  Orbital velocity |
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If the gravitational force between two objects were proportional to \(\frac{1}{R}\) (and not as\(\frac{1}{R^2}\)) where \(R\) is the separation between them, then a particle in circular orbit under such a force would have its orbital speed \(v\) proportional to:
1. \(\frac{1}{R^2}\)
2. \(R^{0}\)
3. \(R^{1}\)
4. \(\frac{1}{R}\)

Subtopic:  Orbital velocity |
 80%
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When a satellite going round the earth in a circular orbit of radius r and speed v loses some of its energy, then r and v change as 

(1) r and v both will increase

(2) r and v both will decrease

(3) r will decrease and v will increase

(4) r will decrease and v will decrease

Subtopic:  Gravitational Potential Energy |
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Which of the following quantities does not depend upon the orbital radius of the satellite ?

(1) TR                            

(2) T2R

(3) T2R2                           

(4) T2R3

Subtopic:  Kepler's Laws |
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A satellite moves round the earth in a circular orbit of radius R making one revolution per day. A second satellite moving in a circular orbit, moves round the earth once in 8 days. The radius of the orbit of the second satellite is -

(1) 8 R                           

(2) 4R

(3) 2R                             

(4) R

Subtopic:  Kepler's Laws |
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A satellite moves in a circle around the earth. The radius of this circle is equal to one half of the radius of the moon’s orbit. The satellite completes one revolution in

(1) 12 lunar month                   

(2) 23 lunar month

(3) 2-32 lunar month               

(4) 232 lunar month

Subtopic:  Kepler's Laws |
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