Asked by Erin

The command module orbited at an altitude of 110 km above the lunar surface. How much time did it take for the command module to complete one orbit?
Answered by oobleck
Look up the mass M of the moon and the gravitational constant G, and then just plug them into your formula

T = 2π√(r^3/(GM))

Note that r is the radius of the orbit, not its altitude above the surface.
Answered by Erin
How do I find the radius of the orbit?
Answered by oobleck
come on, come on.
It's the radius of the moon + 110 km
Answered by Erin
I am not good at physics, hence why I came here for help and not to be put down. Thanks.
Answered by oobleck
sorry. you don't have to know any physics to figure that out, if you just draw a diagram of the satellite going around the moon. I don't mind helping, but I do kind of expect you to put in some effort as well.
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