Homework Help: physics 213

Posted by Erin on Sunday, February 19, 2012 at 4:38pm.

Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 44.7 km/s and 56.2 km/s. The slower planet's orbital period is 8.61 years. (a) What is the mass of the star? (b) What is the orbital period of the faster planet, in years?

I got M= 5.57 E32 and it is wrong, making my time wrong. What equation do I use for (a)?

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