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The distance of the centres of moon the ...

The distance of the centres of moon the earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitational force on a particle will be zero.

A

`D/2`

B

`(2D)/3`

C

`(4D)/5`

D

`(9D)/10`

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The correct Answer is:
D
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ALLEN-GRAVITATION-EXERCISE 1
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  4. A satellite of the earth is revolving in a circular orbit with a unifo...

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  5. Following curve shows the variation of intesity of gravitational field...

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  6. Suppose the acceleration due to gravity at earth's surface is 10ms^-2 ...

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  7. Assume that a tunnel is dug through earth from North pole to south pol...

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  10. One can easily "weigh the earth" by calculating the mass of earth usin...

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  12. The value of 'g' reduces to half of its value at surface of earth at a...

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  15. Gravitation on moon is (1)/(6) th of that on earth. When a balloon fil...

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  16. The acceleration due to gravity g and density of the earth rho are rel...

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  17. Will 1 kg sugar be more at poles or at the equator?

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  18. When you move from equator to pole, the value of acceleration due to g...

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  20. Weight of a body of mass m decreases by 1% when it is raised to height...

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