JEE Main & Advanced
Physics
Gravitation / गुरुत्वाकर्षण
Question Bank
Self Evaluation Test - Gravitation
question_answer
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:
A)1
B)8.5
C)17
D)34
Correct Answer:
C
Solution :
[c] \[g'=g-{{\omega }^{2}}R,\]for g? to be zero, \[\omega '=\sqrt{g/R}\simeq 17\omega \]