A satellite is to revolve around the Earth in a circle of radius 8000 km. The speed at which this satellite be projected into an orbit, will be:

Options

A. 3 km/s
B. 16 km/s
C. 7.15 km/s
D. 8 km/s

Answer

C

Explanation

`v_(0)=sqrt((GM)/(r))`
`=sqrt((gR^2)/(r))=sqrt((10xx(64xx10^5)^(2))/(8000xx10^3))`
`=71.5xx10^(2)m//s=7.15km//s`