Question
Thu July 07, 2011 By:

if a man weighs 60 kg on earth, then how far must he go from the center of the earth so that he weighs 30 kg? could i know the steps to do this problem.

Expert Reply
Thu July 07, 2011
Here, it is given that- 'A man weighs 60 kg on earth'; now kg is the unit of mass and not weight.
Now, mass of a body is proportional to the quantity of matter contained in the body and independent of acceleration due to gravity. Therefore, the mass of the body does not change with depth/height and hence it will be 30 kg nowhere.
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