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## Homework Statement

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?

M=7.34x10^22kg

r=7738+60

G=6.67x10^-11

## Homework Equations

t^2=4pi^2r^3/GM(source)

## 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^2= 3.8237...

T=Square Root(ANS)

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!