Q .     A satellite is in a circular orbit around the earth at an altitude `R` above the earth's surface, where `R` is the radius of the earth. If `g` is the acceleration due to gravity on the surface of the earth, the speed of the satellite is:

BITSAT 2012
A

`\sqrt{2 Rg}`

B

`\sqrt{Rg}`

C

`\sqrt{ \frac{Rg}{2}}`

D

`\frac{\sqrt{Rg}}{4}`

HINT

The gravitational force acting on satellite at an altitude `R` causes the centripetal acceleration it required.

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