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What should be the velocity of earth due to rotation about its own axis so that the weight at equator become 3/5 of initial value. Radius of earth on equator is 6400 km

(a)    7.4 × 10-4 rad /sec                    (b)  6.7 × 10-4 rad /sec

(c)    7.8 × 10-4 rad /sec                  (d)   8.7 10-4 rad /sec

Answer:  c

(36)

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