two satellites of masses m1 and m2( m1>m2) are revolving aroumd the earth in ircular orbits of radii r1 and r2 (r1>r2 ) respectively. Which of the following is true regarding their respective speeds v1 and v2?
A. v1=v2 B.v1>v2 C. v1<v2 D. cannot be predicted
Velocity of a satellite is given by V = sqrt(GM/r) here G = gravitational constant, M = Mass of satellite, r = radius.
So, for satellite 1 V1 = sqrt(GM/r1) and for satellite 2 V2 = sqrt(GM/r2). Here I have assumed the mass of both the satellite two be same.
Divide the two equation and you will get your answer which is option B.