question_answer

Two satellite A and B around a planet P in circular orbits having radius 4R and R respectively. If the speed  of satellite A is 3V, then the speed of satellite B is:       

A) 6V

B) 12V

C) 8V

D) none of these              

Correct Answer: A

Solution :

Fact: Gravitational force of attraction provides the necessary centripetal force. Suppose M be the mass s of planet and R its radius the gravitational force provides the necessary centripetal force. Note: Orbital speed of satellite depends only upon its height above the planet and not on its mass.