1.

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 [AMU 1999]

A.    \[7.4\times {{10}^{-4}}\,rad/\sec \]
B.   \[6.7\times {{10}^{-4}}\,rad/\sec \]
C.    \[7.8\times {{10}^{-4}}\,rad/\sec \]
D.   \[8.7\times {{10}^{-4}}\,rad/\sec \]
Answer» D.   \[8.7\times {{10}^{-4}}\,rad/\sec \]


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