Question

A planet of mass m is orbiting a star of mass M ( ≫ ). Initially (at t = 0), the planet has a circular orbit, i.e. is a constant and = 0. It then enters a region where the star's atmosphere is dense and as a result, experiences a small friction force = −, where v is the velocity of the planet and is a positive constant. Calculate
(i) The rate at which the total energy (E) of the planet decreases (dE/dt) as a function of r.
(ii) The time dependence of the radius (r), assuming that the orbit stays approximately circular.

Answer 1

Answer:

plz give the force equation in ur question correctly.. it's a good question..