Homework Help: astronomy

Posted by jessica on Monday, July 16, 2007 at 3:41am.

when earth and mars are closest to each other in their orbits the angular separation between mars's moon phobos and the surface of mars is observed to be 22 arc seconds. if phobos orbits mars every .31910 days what is the average density of mars expresses in kilograms per cubic meter? i need to know the steps to solve the problem, also.

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