Question

When a satellite going round the earth in a circular orbit of radius r and speed v loses some of its energy, then r and v changes as 

(A) r and v both will increase 

(B) r and v both will decease 

(C) r will decrease and v will increase 

(D) r will increase and v will decrease

Answer 1

Correct option: (C) r will decrease and v will increase

Explanation:

When energy decreases i.e. it becomes mare negative then r will decrease now KE = [(GMm) / 2r] i.e. when total energy decrease, KE will be more as TE = – KE

KE = (1/2)mV² i.e. if KE is increasing to keep TE constant then Velocity V will increase