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22 Apr 2009 11:11:37 IST

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At what height the gravitational field reduces by 75% the gravitational field at the surface of the

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At what height the gravitational field reduces by 75% the gravitational field at the surface of the earth? Options are R,,, 2R,,,,3R,,,,,4R

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NugoRama

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Joined: 11 Mar 2009

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22 Apr 2009 11:22:04 IST

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for going up....

g*=g(R/R+h)^2

for 75% reduction...

g*=g/4...

g/4=g(R/R+h)^2

1/4=(R/R+h)^2

1/2=R/R+h

hence ....h=R..

Jammalamadaka

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Joined: 23 Nov 2008

Posts: 156

22 Apr 2009 17:34:34 IST

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Thanks

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