Physics 9702/43 — May/June 2022

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

questions

100

marks

120

minutes

Topics Magnetic Fields · Gravitational Fields · Motion in a Circle · Electric Fields · Ideal Gases · Thermodynamics · +7 more

Q1Gravitational FieldsFree sample

(a)

(i)

State Newton’s law of gravitation.

(ii)

Use Newton’s law of gravitation to show that the gravitational field strength $g$ at a distance $r$ away from a point mass $M$ is given by

g = \frac{GM}{r^2} .

(b)

The Earth has a mass of $5.98 \times 10^{24}\ \text{kg}$ and a radius of $6.37 \times 10^6\ \text{m}$ .
The Moon has a mass of $7.35 \times 10^{22}\ \text{kg}$ and a radius of $1.74 \times 10^6\ \text{m}$ .
The Earth and the Moon can both be considered as point masses at their centres. Their centres are a distance of $3.84 \times 10^8\ \text{m}$ apart.

(i)

Show that the gravitational field strength at the surface of the Moon due to the mass of the Moon is $1.62\ \text{N kg}^{-1}$ .

(ii)

Explain why there is a point X on the line between the centres of the Earth and the Moon where the resultant gravitational field strength due to the Earth and the Moon is zero.

(iii)

Calculate the distance $x$ of point X from the centre of the Moon.

$x$ = ______ $\text{m}$

The rest of this paper

9 more questions

Q2Magnetic Fields · Motion in a Circle · Electric Fields8M
Q3Ideal Gases · Thermodynamics11M
Q4Oscillations8M
Q5Alternating Currents · Capacitance12M
Q6Magnetic Fields11M
Q7Quantum Physics10M
Q8Nuclear Physics12M
Q9Medical Physics9M
Q10Astronomy and Cosmology9M

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