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Q.

A body weighs 700g wt on the surface of the earth , How much will it weight on the surface of a planet whose mass is 1/7 and radius is half that of the earth

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a

50 g wt

b

400 g wt

c

300 g wt

d

200 g wt

answer is B.

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Detailed Solution

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g=GMR2

g1=GM(R/2)2

mg1=m47GMR2

mg'=47(700)=400 g w

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