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The radius of the earth is 6400 km and 2 sec / 10 m g  . In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is

1. 1/80 radian / sec
2. 1/400 radian / sec
3. 1/800 radian / sec
4. 1/1600 radian / sec

Correct answer: 1/800 radian / sec

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