Satellites P and Q

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Satellites P and Q, each of mass

m

, revolve around the same planet in circular orbits of radii

2R

and

3R

respectively (measured from the planet’s centre). If the planet exerts a gravitational force

F_{P}

on P, what is the ratio

F_{P} : F_{Q}

? (a)

3 : 2

(b)

9 : 4

(c)

4 : 9

(d)

2 : 3