Physics 9702/42 — October/November 2014

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

questions

100

marks

120

minutes

Topics Ideal Gases · Magnetic Fields · Alternating Currents · Communication · Gravitational Fields · Motion in a Circle · +7 more

Q1Gravitational FieldsFree sample

An isolated spherical planet has a diameter of $6.8 \times 10^{6}\ \text{m}$ . Its mass of $6.4 \times 10^{23}\ \text{kg}$ may be assumed to be a point mass at the centre of the planet.

(a)

Show that the gravitational field strength at the surface of the planet is $3.7 \text{ N kg}^{-1}$ .

(b)

A stone of mass $2.4\ \text{kg}$ is raised from the surface of the planet through a vertical height of $1800\ \text{m}$ .
Use the value of field strength given in (a) to determine the change in gravitational potential energy of the stone.
Explain your working.

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

(c)

A rock, initially at rest at infinity, moves towards the planet. At point P, its height above the surface of the planet is $3.5 D$ , where $D$ is the diameter of the planet, as shown in Fig. 1.1.

Fig. 1.1

Calculate the speed of the rock at point P, assuming that the change in gravitational potential energy is all transferred to kinetic energy.

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

The rest of this paper

12 more questions

Q2Motion in a Circle6M
Q3Ideal Gases7M
Q4Oscillations10M
Q5Electric Fields8M
Q6Magnetic Fields · Alternating Currents5M
Q7Alternating Currents · Magnetic Fields9M
Q8Quantum Physics8M
Q9Nuclear Physics · Ideal Gases8M
Q10Electronics · Temperature11M
Q11Medical Physics7M
Q12Communication8M
Q13Communication4M

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