Calculate the centripital force exerted on the Earth by the Sun. Assume that the period of one revolution is 365.25 days. The average distance is 1.5X10^8 km and the Earth's mass is 6X10^24 kg. ok so first I turned the time into seconds. Then I tried to find the velocity of the Earth using the equation: Vt=2piR/T so that became: Vt=2pi(1.5X10^8km)/(31557600sec) so the velocity was 29.86531 m/s I then plugged it into the equation Fcep=mVt^2/r so F=(6X10^24)(29.86531)^2/(1.5X10^8) F=3.5677X10^19 apparently that was the wrong answer. I was hoping that someone could see what I did wrong and help me out.