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WBCS 2024 · Question 72 of 196

A planet of mass m is revolving around the sun in a circle of radius r. What is the work done by the gravitational force F in moving the planet over half the circumference of the circle?

Science - Physics

  1. AzeroCorrect
  2. BF× 2π
  3. CFx πι
  4. DFx 2r

Answer: A. zero

Explanation

Official WBPSC key (Series A): (A) zero. The work done by the gravitational force is exactly 0 because the centripetal gravitational force vector operates perpendicular 90° to the tangential displacement path of the planet at all times.

Source: WBCS (Exe) etc. (Prelim) 2024, Series A

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