1. Both the ice skate and the satellite are undergoing a form of circular motion. This circular motion entails tangential momentum but also some form of a centripetal force causing a centripetal acceleration. This acceleration does not effect the magnitude of the object's velocity, but rather the direction. The forces providing this centripetal accelerations are different for the ice skater and the satellite. The ice skater's centripetal force is provided by contact forces between the skates and the ice while the centripetal force for the satellite is provided by gravity.NEXT QUESTION:
1. An ice skater coats around a uniform circular track at constant speed. Compare and contrast the motion of the skater with the motion of a satellite orbiting the Earth (3M)
2. Europa and Lo are the moons that orbit Jupiter, and Europa orbits (orbital radius) at a distance of 670,900 km from the centre of Jupiter. Calculate the distance between the centres of Lo and Saturn GIVEN that Europa takes exactly 4 times as along as Lo to orbit Saturn. Give your answers to 2 significant figures. (3M)
I'm a little bit confused by 2. It sounds like a Kepler's law of periods question, but I don't know how I could calculate it without the relative masses of Jupiter and Saturn. Also, in the question you've said that Li orbits Jupiter, than you said it orbits Saturn. What's going on?