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Homework Statement
My question is about a double atwood machine like this:
http://farside.ph.utexas.edu/teaching/336k/Newton/img1915.png
Now imagine that m1 = 5m, m2=2m, m3=3m
My question is: why does the upper pulley rotate despite the fact that the masses on either side are equal?
And secondly - why do we take x' to be measured from the second pulley, rather than from the top again?
Thanks!