Gravitation Question 319

Question: The speed of earth’s rotation about its axis is cd. Its speed is increases to x times to make the effective acceleration due to gravity equal to zero at the equator. Then x is:

Options:

A) 1

B) 8.5

C) 17

D) 34

Show Answer

Answer:

Correct Answer: C

Solution:

  • $ [g’=g-{{\omega }^{2}}R,] $ for g? to be zero, $ [\omega ‘=\sqrt{g/R}\simeq 17\omega ] $


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