A satellite of negligible mass moves in a circular orbit of radius around a planet of mass
PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A satellite of negligible mass moves in a circular orbit of radius r around a planet of mass M. (i) State Newton’s law of universal gravitation. (ii) Explain, without performing any numerical calculation, how careful measurements of the satellite’s orbital radius and time period can be used to obtain an estimate of the planet’s mass. Your answer should clearly link the relevant physical ideas and express the mass in terms of the measurable quantities.