HELP!!!! I just got this assignment over the email a couple hours ago and it's due in the morning and I have no clue how to do these problems! I've spent a few hours trying to figure this stuff out on my own, but I'm down to these last few and I just can't do it. if you can answer one or more, I really appreciate anything AT ALL. I'm sorry I don't have much done already, but I've got a brain block and I'm starting to panic. please help!!! 2. If a satellite circles the earth at 9000 km from the center, estimate its period T in seconds. 3. Convert 1/r = C - Dcos(theta) or 1= Cr-Dx into the xy equation of an ellipse. 5. The Earth takes 365.25 days to go around the sun at at distance d = 93 million miles = 150 million km. find the mass of the sun. F=ma=constant/r^2.