Physics 9702/42 — May/June 2021

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

questions

100

marks

120

minutes

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

Q1Gravitational FieldsMotion in a CircleFree sample

(a)

Define gravitational field strength.

(b)

An isolated planet is a uniform sphere of radius $3.39 \times 10^{6}\ \text{m}$ . Its mass of $6.42 \times 10^{23}\ \text{kg}$ may be considered to be a point mass concentrated at its centre. The planet rotates about its axis with a period of $24.6$ hours.

For an object resting on the surface of the planet at the equator, calculate, to three significant figures:

(i)

the gravitational field strength

field strength = ______ $\text{N kg}^{-1}$

(ii)

the centripetal acceleration

acceleration = ______ $\text{m s}^{-2}$

(iii)

the force per unit mass exerted on the object by the surface of the planet.

force per unit mass = ______ $\text{N kg}^{-1}$

The rest of this paper

11 more questions

Q2Ideal Gases · Thermodynamics9M
Q3Oscillations9M
Q4Communication8M
Q5Electric Fields · Quantum Physics · Nuclear Physics9M
Q6Capacitance8M
Q7Electronics · Temperature9M
Q8Magnetic Fields · Electric Fields · Motion in a Circle10M
Q9Magnetic Fields9M
Q10Alternating Currents8M
Q11Medical Physics6M
Q12Quantum Physics9M

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