If by some phenomenon the Earth contracts to one half of its present size, then the value of gravitational potential energy becomes:
Correct answer: A. Double
- A. Double
- B. One-half
- C. Remains the same
- D. Four times
Explanation
The formula for gravitational potential energy is U = -GMm/r Hence, U = 1/r. If r/2, then U = 1/(r/2). Therefore U = 2(1/r), the gravitational potential energy is doubled.
This question appeared on the NUMS 2021 paper, which you can sit online with every answer explained.
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