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9702/41

Physics 9702/41 — October/November 2011

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

11
questions
100
marks
120
minutes

Topics Magnetic Fields · Electric Fields · Communication · Gravitational Fields · Motion in a Circle · Ideal Gases · +6 more

Q1Gravitational FieldsMotion in a CircleFree sample
(a)

A moon is in a circular orbit of radius rr about a planet. The angular speed of the moon in its orbit is ω\omega. The planet and its moon may be considered to be point masses that are isolated in space.

Show that rr and ω\omega are related by the expression

r3ω2=constant.r^3\omega^2 = \text{constant.}

Explain your working.

3M
(b)

Phobos and Deimos are moons that are in circular orbits about the planet Mars. Data for Phobos and Deimos are shown in Fig. 1.1.

(i)

Use data from Fig. 1.1 to determine

  1. the mass of Mars.

mass = ______ kg\text{kg}

  1. the period of Deimos in its orbit about Mars.

period = ______ hours\text{hours}

6M
(ii)

The period of rotation of Mars about its axis is 24.6 hours. Deimos is in an equatorial orbit, orbiting in the same direction as the spin of Mars about its axis.

Use your answer in (i) to comment on the orbit of Deimos.

1M

The rest of this paper

10 more questions
  • Q2Ideal Gases · Thermodynamics10M
  • Q3Oscillations · Magnetic Fields11M
  • Q4Electric Fields8M
  • Q5Magnetic Fields · Electric Fields4M
  • Q6Alternating Currents7M
  • Q7Quantum Physics11M
  • Q8Nuclear Physics9M
  • Q9Electronics10M
  • Q10Communication10M
  • Q11Communication10M
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