Physics Problem Satellites in Circular Orbits: What is the orbital speed of the second satellite?
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 X 10(to the 4th power) m/s, and the radius of the orbit is 5.25 X 10(to the 6th power) m. A second satellite also has a circular speed around this same planet. The orbit of this second satellite has a radius of 8.60 X 10(to the 6th power) m. What is the speed of the second satellite?
here u have to apply keplers law
p^2 is directly proportional to the r^3.
here p is the time taken for 1 revolution & r is the radius of the orbit.
so here p1^2/p2^2=r1^3/r2^3
u r given the speed of one .
form there u can calculate p.
u will get p from which u will b able to get speed of 2.