The Earth and the Moon may be considered to be uniform spheres that are isolated in space. The Earth has radius R and mean density ρ. The Moon, mass m, is in a circular orbit about the Earth with radius nR, as illustrated in Fig. 1.1. Moon nR Earth radius R [Figure 1.1] The Moon makes one complete orbit of the Earth in time T.

Q: What topic does this question test?

This question tests Gravitational fields in A-Level Physics (syllabus code 9702). It is worth 9 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2017 examination, Paper 4 Variant 3 (9702_s17_qp_43.pdf).

Question

The Earth and the Moon may be considered to be uniform spheres that are isolated in space. The Earth has radius R and mean density ρ. The Moon, mass m, is in a circular orbit about the Earth with radius nR, as illustrated in Fig. 1.1. Moon nR Earth radius R [Figure 1.1] The Moon makes one complete orbit of the Earth in time T.

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