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**1. Homework Statement**

A planet orbiting a star experiences a force of magnitude 3x1022N due to gravitational attraction to the star. If the planet has a speed of 2x107 m/s to complete on orbit, calculate the mass of the planet and radius of the orbit? Assume the orbit to be a perfect circle.

**2. Homework Equations**

I believe I have to use these equations but none of them really work for me at the moment.

I figured this would have something to do with it but I don't understand it.

**3. The Attempt at a Solution**

When I use any of the equations above I'm always missing something. These equations have been given by my teacher but at this point I'm not even sure I have the right equations. My attempt at a solution isn't even worth writing here. Please help!