Applejuice Posted May 5, 2014 Share Posted May 5, 2014 (edited) After receiving amazing help last time from Swansont, I really hope someone can help me again! The question is the following: Janus and Epimetheus are moons of Saturn. The difference in the radius of their circular orbit is 50 km. De radius of the inner moon is 2.51 times the radius of Saturn. Calculate after how many orbits the inner moon passes the outer moon. Below is my sketch of the question. Can someone tell me if I'm going about this the right way? Can I just call the radius of Saturn x? Or do I actually have to look up the radius of Saturn? Or am I approaching this completely wrong? Anyway, after some searching I think I need to use the proportion of the distance to the period. , with P in earthyears and R in AU (is that correct?). I'm not really sure how to continue. Can anyone give me a push in the right direction or correct me somewhere? Edited May 5, 2014 by Applejuice Link to comment Share on other sites More sharing options...
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