Gravitation Question 11

Question: The radius of the earth is 6400 km and [g=10m/sec2] . In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is[MP PMT 1985]

Options:

A) 1/80 radian/sec

B) 1/400 radian/sec

C) 1/800 radian/sec

D) 1/1600 radian/sec

Show Answer

Answer:

Correct Answer: C

Solution:

For the condition of weightlessness at equator [ω=gR] \ [ω=1640×103=1800rad/s]



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