Physics 9702/42 — May/June 2023

Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme

questions

100

marks

120

minutes

Topics Ideal Gases · Gravitational Fields · Motion in a Circle · Temperature · Thermodynamics · Oscillations · +7 more

Q1Gravitational FieldsMotion in a CircleFree sample

(a)

State Newton’s law of gravitation.

(b)

A satellite is in a circular orbit around a planet. The radius of the orbit is $R$ and the period of the orbit is $T$ . The planet is a uniform sphere.

Use Newton’s law of gravitation to show that $R$ and $T$ are related by

4\pi^2R^3 = GMT^2

where $M$ is the mass of the planet and $G$ is the gravitational constant.

(c)

The Earth may be considered to be a uniform sphere of mass $5.98 \times 10^{24}\ \text{kg}$ and radius $6.37 \times 10^6\ \text{m}$ .

A geostationary satellite is in orbit around the Earth.

Use the expression in (b) to determine the height of the satellite above the Earth’s surface.

height = ______ $\text{m}$

(d)

Another satellite is in a circular orbit around the Earth with the same orbital radius and period as the satellite in (c).

(i)

Calculate the angular speed of the satellite in this orbit. Give a unit with your answer.

angular speed = ______ unit ______

(ii)

Despite having the same orbital period, the orbit of this satellite is not geostationary.

Suggest two ways in which the orbit of this satellite could be different from the orbit of the satellite in (c).

1 ______

2 ______

The rest of this paper

9 more questions

Q2Ideal Gases · Temperature12M
Q3Thermodynamics · Ideal Gases9M
Q4Oscillations11M
Q5Capacitance9M
Q6Magnetic Fields10M
Q7Alternating Currents10M
Q8Quantum Physics8M
Q9Nuclear Physics · Astronomy and Cosmology11M
Q10Medical Physics9M

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