On each of the apollo missions the command module was placed in a very low aprox circular orbit above the moon. Assum the avrg hieght was 60km above surface of moon and moons radius is 7738km. (Mass of moon=7.34x10^22kg)
What was the command modules orbital period?
The Attempt at a Solution
T^2=4pi^2(7738+60)^3 / (6.67x10^-11)(7.34x10^22)
T^2= (1.87...x10^13) / (4.89...x10^12)
T= (1.9554.. Days x 24 Hours) = (46.93.. Hours)
But the back of my worksheet says the answer is 17.2 hours or 6.18x10^4 seconds
GAH I am so confused! >_< Your help is much appreciated!