The radius of the earth is 6400 km and g=10 m/ sec2 . In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is
(a) 1/80 radian/sec (b) 1/400 radian/sec
(c) 1/800 radian/sec (d) 1/1600 radian/sec
Answer: c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a