1.1. Two of Jupiter's moons, Ganymede and Callisto orbit around Jupiter in a circular path, as shown in Fig 1.1. 

Fig 1.1 shows the North pole of Jupiter, where both moons orbit counter-clockwise.

Fig 1.1

Identify, by drawing arrows, the following:

(i) the centripetal force on each moon. Label this F.

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(ii) the linear velocity of each moon. Label this v.

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1.2. Both of Jupiter's moons travel at a speed of roughly 10 000 m s^–1. 

State which moon will have a longer time period. Explain your answer.

1.3. The centripetal acceleration of Ganymede is 0.11 m s^–2.

The mass of Ganymede is 1.48 x 10²³ kg. 

Determine the centripetal force on Ganymede.

1.4. Explain how the centripetal force of an object with the same mass and orbit as Ganymede would compare if it travelled with twice the angular speed.