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Weight of a Body :: Discussion

1.	Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down to the centre of the earth if it weighed 250N on the surface?
	A.	125N
	B.	250N
	C.	0N
	D.	120N

	Answer: Option A


	Explanation:
	Here mg = 250N, d = R/2 Acceleration due to gravity at depth d = R/2, below the earth’s surface will bw g_d=g(1-d/R)=g(1-(R/2)/R)=g/2 Therefore, new weight = mg_d=mg/2=250/2=125N.



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Published by:Michael Daani

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