Physics 9702/42 — February/March 2020

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

questions

100

marks

120

minutes

Topics Temperature · Magnetic Fields · Medical Physics · Quantum Physics · Gravitational Fields · Ideal Gases · +8 more

Q1Gravitational FieldsFree sample

(a)

Define gravitational potential at a point.

(b)

TESS is a satellite of mass $360\text{ kg}$ in a circular orbit about the Earth as shown in Fig. 1.1.

Fig. 1.1

The radius of the Earth is $6.4 \times 10^{6}\text{ m}$ and the mass of the Earth, considered to be a point mass at its centre, is $6.0 \times 10^{24}\text{ kg}$ .

(i)

It takes TESS $13.7$ days to orbit the Earth.

Show that the radius of orbit of TESS is $2.4 \times 10^{8}\text{ m}$ .

(ii)

Calculate the change in gravitational potential energy between TESS in orbit and TESS on a launch pad on the surface of the Earth.

change in gravitational potential energy = ______ $\text{J}$

(iii)

Use the information in (b)(i) to calculate the ratio:

\frac{\text{gravitational field strength on surface of Earth}}{\text{gravitational field strength at location of TESS in orbit}}

ratio = ______

The rest of this paper

11 more questions

Q2Ideal Gases · Temperature10M
Q3Oscillations · Magnetic Fields10M
Q4Medical Physics8M
Q5Communication7M
Q6Electric Fields · Capacitance8M
Q7Temperature · Electronics7M
Q8Magnetic Fields · Motion in a Circle8M
Q9Alternating Currents8M
Q10Quantum Physics7M
Q11Medical Physics · Quantum Physics9M
Q12Nuclear Physics8M

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