1. Solve the general problem for the x-cm location, as measured from the left-most mass (m1). Check your text, to make sure you're right.
2. Use this to determine the location of the cm of the Earth/Moon system. Anything weird about this answer?
3. Look at the general expression for the cm of a rigid body. We'll delve into this in class.
4. Try these problem: ch.9 - 2, 4, if time do 3, 5, 6
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