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CHECK YOURSELF ANSWERS
1Since Fâ1r2, the force will become nine times smaller.
2The acceleration is the same as the gravitational field strength.
Hence a=GMr2=GM(2R)2=14GMR2=g4.
3The force is mg = 0.40 Ã 15 = 6.0 N.
4When they come near the sun they move very fast and so on the average spend most of their time away from the sun and out of sight.
5EP = mV = â2.0 Ã 1010 Ã 350 = â7.0 Ã 1012 J
6The force does not stay constant as we move from A to B.
7It is zero since the gradient at P is zero.
