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Two small and heavy spheres, each of mas...

Two small and heavy spheres, each of mass M, are placed a distance r apart on a horizontal surface. The graviational potential at the mid-point on the line joining the centre of the spheres is :-

A

Zero

B

`- (GM)/r`

C

`- (2 GM)/r`

D

`- (4GM)/r`

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The correct Answer is:
D
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ALLEN -GRAVITATION-EXERCISE 1
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  2. A projectile of mass m is thrown vertically up with an initial velocit...

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  3. Two small and heavy spheres, each of mass M, are placed a distance r a...

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  4. An artificial satellite moving in a circular orbit around the earth ha...

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  5. A particle of mass m is moving in a horizontal circle of radius R unde...

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  6. Potential energy of a 3kg body at the surface of a planet is -54 J, th...

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  7. Escape velocity of a body 1 kg mass on a planet is 100 ms^(-1). Gravit...

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  8. The ratio of radii of two satellites is p and the ratio of their accel...

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  9. The escape velocity for a body projected vertically upwards from the s...

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  10. The escape velocity for the earth is 11.2 km / sec . The mass of anoth...

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  11. A body is projected vertically upwards from the surface of the earth w...

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  12. Binding energy of moon and earth is :-

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  13. Two artificial satellites A and B are at a distance r(A) and r(B) abov...

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  14. The average radii of orbits of mercury and earth around the sun are 6x...

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  15. A body is dropped by a satellite in its geo-stationary orbit :

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  16. Two ordinary satellites are revolving round the earth in same elliptic...

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  17. Kepler's second law is a consequence of

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  18. One projectile after deviating from its path starts moving round the e...

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  19. In adjoining figure earth goes around the sun in eliptical orbit on wh...

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  20. Potential energy and kinetic energy of a two particle system under Ima...

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