Question

The radii of circular orbits of two satellite `A` and `B` of the earth are `4R` and `R`, respectively. If the speed of satellite `A` is `3v`, then the speed of satellite `B` will be
A. 3v/4
B. 6v
C. 12v
D. 3v/2

Answer 1

Correct Answer - B
speed of satellite `V=sqrt((GM)/(r ))`
`implies (V_(B ))/(V_(A))=sqrt((r_(A))/(r_(B))=sqrt((4R)/(R ))=2`
`implies V_(B)=(3v)(2)=6v`