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 ] $
