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What should be the angular speed of earth, so that body lying on equator may appear weightlessness ( g = 10 m/s2, R=6400 km )

(a)      1/800  rad/s                               (b)  1/400 rad/s

(c)       1/600   rad/s                              (d)  1/100 rad/s

Answer: a

(4)

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