Question

Two satellites of masses 50 kg and 100 kg revolve around the earth in circular orbits of radii 9R and 16R. What is the ratio of speeds of the two satellites?

(a) 3:4

(b) 4:3

(c) 9:16

(d) 16:9

Answer 1

Right choice is (b) 4:3

The explanation: Orbital velocity is inversely proportional to the square root of the orbital radius.

Hence;

v1 : v2 = 16^1/2 : 9^1/2

 = 4 : 3