Post-UTME Physics 2005 Objective — Question 20
Question 20 of 23 from the Post-UTME Screening (Post-UTME) Physics 2005 Objective paper, with the correct answer and a full explanation.
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An object weighs 100N on the earth's surface. Find its weight at a point P with orbital radius 2R [g=10NKg^-1].
- A. 40.0N
- B. 35.0N
- C. 25.0NCorrect
- D. 20.0N
Explanation
Gravitational field strength falls off as 1/r^2; at radius 2R (double the surface radius), weight = 100/(2^2) = 25.0N.
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