With only two lectures in my back pocket, I still can't find a reasonable solution for this problem.(adsbygoogle = window.adsbygoogle || []).push({});

Suppose that a planet were discovered between the sun and Mercury, with a circular orbit of radius equal to 2/3 of the average orbit radius of Mercury. The orbital period of Mercury is 88.0 days.

What would be the orbital period of such a planet?

and also, in general:

Four identical masses of mass 500 kg each are placed at the corners of a square whose side lengths are 15. cm.

What is the magnitude of the net gravitational force on one of the masses, due to the other three?

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# Homework Help: Theres something about gravitational

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