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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

W=mg=700gwt ----(1)We know thatg=GMR2On the planetgp=GMpRp2=GM/7R22=GM4R27=47g∵g=GMR2Hence weight on the planet=mgp==m4g7=700×47=400  g wt  from (1)
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