Physics 9702/41 — October/November 2013

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

questions

100

marks

120

minutes

Topics Magnetic Fields · Communication · Gravitational Fields · Ideal Gases · Thermodynamics · Oscillations · +7 more

Q1Gravitational FieldsFree sample

(a)

Define gravitational potential at a point.

(b)

The Moon may be considered to be an isolated sphere of radius $1.74 \times 10^{3}\ \text{km}$ with its mass of $7.35 \times 10^{22}\ \text{kg}$ concentrated at its centre.

(i)

A rock of mass $4.50\ \text{kg}$ is situated on the surface of the Moon. Show that the change in gravitational potential energy of the rock in moving it from the Moon’s surface to infinity is $1.27 \times 10^{7}\ \text{J}$ .

(ii)

The escape speed of the rock is the minimum speed that the rock must be given when it is on the Moon’s surface so that it can escape to infinity.
Use the answer in (i) to determine the escape speed. Explain your working.

speed = ______ $\text{m s}^{-1}$

(c)

The Moon in (b) is assumed to be isolated in space. The Moon does, in fact, orbit the Earth.
State and explain whether the minimum speed for the rock to reach the Earth from the surface of the Moon is different from the escape speed calculated in (b).

The rest of this paper

11 more questions

Q2Ideal Gases · Thermodynamics8M
Q3Oscillations7M
Q4Electric Fields11M
Q5Magnetic Fields9M
Q6Magnetic Fields · Motion in a Circle8M
Q7Quantum Physics9M
Q8Nuclear Physics11M
Q9Electronics · Temperature7M
Q10Medical Physics13M
Q11Communication5M
Q12Communication5M

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