1. The problem statement, all variables and given/known data 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. Relevant 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!