Physics 9702/43 — May/June 2015

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

questions

100

marks

120

minutes

Topics Gravitational Fields · Motion in a Circle · Electric Fields · Magnetic Fields · Quantum Physics · Thermodynamics · +9 more

Q1Gravitational FieldsMotion in a CircleFree sample

(a)

State Newton’s law of gravitation.

(b)

The planet Neptune has eight moons (satellites). Each moon orbits Neptune in a circular path of radius $r$ with a period $T$ .

Assuming that Neptune and each moon behave as point masses, show that $r$ and $T$ are related by the expression

GM_N = \frac{4\pi^2r^3}{T^2}

where $G$ is the gravitational constant and $M_N$ is the mass of Neptune.

(c)

Data for the moon Triton that orbits Neptune and for the moon Oberon that orbits the planet Uranus are given in Fig. 1.1.

Fig. 1.1

Use the expression in (b) to determine the ratio

\frac{\text{mass of Neptune}}{\text{mass of Uranus}}

ratio = ______

The rest of this paper

12 more questions

Q2Thermodynamics · Ideal Gases8M
Q3Temperature9M
Q4Oscillations8M
Q5Electric Fields · Capacitance6M
Q6Gravitational Fields · Electric Fields · Magnetic Fields · Motion in a Circle9M
Q7Alternating Currents4M
Q8Quantum Physics9M
Q9Nuclear Physics9M
Q10Electronics8M
Q11Medical Physics6M
Q12Communication9M
Q13Magnetic Fields · Quantum Physics7M

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