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JAMB Physics 2015 (CBT) Question 1

Question 1

Gravitational Field

A satellite moves in a circular orbit of radius 4R round the earth. The acceleration of the satellite in terms of g is

  1. A.4/g
  2. B.g/4
  3. C.g/16
  4. D.16/g
Show the answer and explanation

Answer: C (g/16)

Explanation

Gravitational acceleration falls as 1/r2. At 4R from the earth's centre it is g/42 = g/16.