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**1. Homework Statement**

A. Suppose you are at the earth's equator and observe a satellite passing directly overhead and moving from west to east in the sky. Exactly 15.0 hours later, you again observe this satellite to be directly overhead. How far above the earth's surface is the satellite's orbit?

B. You observe another satellite directly overhead and traveling east to west. This satellite is again overhead in 15.0 hours. How far is this satellite's orbit above the surface of the earth?

**2. Homework Equations**

T

^{2}=4π

^{2}r

^{3}/GM

**3. The Attempt at a Solution**

I was not sure how to account for the rotation of the earth, but I tried 15/(1+15/24)=9.23 hours, and then used that for T. I plugged in 6.67*10

^{-11}for G and 5.97 *10

^{24}for M. I solved for r giving me 2.23*10

^{7}meters.

Where did I go wrong? Thanks so much for any help!