AQA Edexcel A Level Physics Gravitational Fields A
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A Level Physics 
Gravitational Fields 2 (Answers) 
Total Marks:/30 
AQA, Edexcel 
A Level 
1. The graph below shows the variation of the orbital period squared with the radius cubed for Jupiter’s 
moons. 
Total for Question 1: 10 
(a) Define a gravitati on al field. [1] 
G 2 
(b ) By equating the centripetal force and the gravitational force on a planet, show that T 2 = 4π r3. 
[4] 
2 
Solution: mv = GmM → v2 GM 
r r2 r 
Since the planet is assu m e =d to be moving in a circle, v = 2πr 
T ...