- #1
flyingpig
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Homework Statement
https://www.youtube.com/watch?v=4zb0t4H0Kec
http://img4.imageshack.us/img4/7388/38804877.th.png [Broken]
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The problem is EXACTLY the same.
But one thing concerns me. The answer key said the force is [tex]-27\mu N \hat{i}[/tex]
From Walter Lewin's method, I got [tex]+27\mu N \hat{i}[/tex]. Help?
The Attempt at a Solution
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