1. The problem statement, all variables and given/known data The mass of the sun is 2x10^30kg and the planet Jupiter averages an orbital distanceof 5.2 AU. Calculate the orbital speed (in mph) and orbital period (in earth years) of Jupiter relative to the Sun: One AU is one Astronomical Unit which is the average earth-sun distance... 1 AU = 1.5x10^11m. 2. Relevant equations Vorb= sqrt(GM/r) T=(2pi*r)/sqrt(GM/r) r = (1.5x10^11m)(5.2) = 7.8x10^11m G = 6.67x10^-11 Nm^2/kg^2 M= 2x10^20kg 3. The attempt at a solution I plugged in the numbers and ended up with... Vorb = 4.39 x 10^4 m/s = 98199.91 mph T= 374751912s = 11.88 years Does this look right?