AP Physics 1 Question 70: Answer and Explanation

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Question: 70

10. Given that the Earth’s mass is m, its tangential speed as it revolves around the Sun is v, and the distance from the Sun to the Earth is R, which of the following correctly describes the work done by the centripetal force, Wc, in one year’s time?

  • A. Wc > 2R(mv2/R)
  • B. Wc = 2R(mv2/R)
  • C. Wc < 2R(mv2/R)
  • D. Cannot be determined

Correct Answer: C


C Centripetal force always acts perpendicular to the object's motion, which means it cannot ever do work.