Q.

A body weighs 700 gm wt on the surface of the earth. How much will it weigh on the surface of a planet whose mass is  17 and radius is half that of the earth

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a

200 gm wt

b

400 gm wt

c

50 gm wt

d

300 gm wt

answer is B.

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Detailed Solution

We know that g=GMR2On the planet gp=GM/7R2/4=4g7=47gHence weight on the planet =700×47=400  gm wt
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A body weighs 700 gm wt on the surface of the earth. How much will it weigh on the surface of a planet whose mass is  17 and radius is half that of the earth