a. Explain what is meant by the gravitational field strength at a point. This diagram shows the

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a. Explain what is meant by the gravitational field strength at a point.

This diagram shows the dwarf planet, Pluto, and its moon, Charon. These can be considered to be a double planetary system orbiting each other about their joint centre of mass.

b. Calculate the gravitational pull on Charon due to Pluto.

c. Use your result to part b to calculate Charon’s orbital period.

d. Explain why Pluto’s orbital period must be the same as Charon’s.

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Cambridge International AS And A Level Physics Coursebook

ISBN: 9781108859035

3rd Edition

Authors: David Sang, Graham Jones, Gurinder Chadha, Richard Woodside

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