1.

 The orbital velocity of a planet revolving close to earth's surface is                       [RPMT 2002, 03]

A.             \[\sqrt{2\,gR}\]
B.             \[\sqrt{gR}\]
C.             \[\sqrt{\frac{2g}{R}}\]           
D.             \[\sqrt{\frac{g}{R}}\]
Answer» C.             \[\sqrt{\frac{2g}{R}}\]           


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