(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A NASA spaceship is orbiting the moon at an altitude of 111 km. How long does it take the ship to make one orbit around the moon?

This was a question on the test I had today, just wondering if I'm out to lunch or not. So he gave us all the info on the moon on an overhead. I used the mass of the moon 7.36*10^22 kg and the radius 1,737,000m added to the altitude.

2. Relevant equations

I used the equation mp=4π²R³/GT²

3. The attempt at a solution

So I plugged in 7.36*10^22=4π²(1848000)³/6.67*10¯¹¹(T²) and solved for t.

I got with sig figs 7120 seconds or something like that on the test. His numbers might have been slightly different. Did I do this completely wrong?

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# Homework Help: Another Planetary Mechanics Question

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