2022 · Specimen · 9702/04 | Q1

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Question (1 of 12)5 marks · Practise this topic →

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Available practice: 77 of 100 marks. Parts 1(b), 4(b)(i), 4(c), 6(a)(ii), 6(b)(ii), 7(a)(i), 7(a)(ii), 9(b)(i), 9(c), 10(b)(ii) await marking support. Scores cover available parts only.

(a)Explain how the force(s) on a satellite can result in the satellite being in a circular orbit around a planet.

Answer guidance

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

[2 marks]

The Earth has mass M, radius R and mean density ρ, and the Moon is in a circular orbit of radius nR about the Earth with period T, where ρ = 3πn³/(GT²).

The radius R of the Earth is 6.38 × 10⁶ m and the distance between the centre of the Earth and the centre of the Moon is 3.84 × 10⁸ m.

The period T of the orbit of the Moon about the Earth is 27.3 days.

(c)Use the expression in (b) to calculate ρ.

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[3 marks]

9702/04/SP/22Cambridge International AS & A Level Physics 9702 · Specimen 2022 · Paper 4 · Question 1