Lights Net Wraps
By admin, on March 24th, 2009
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Lights Net Wraps
Physics 1 Question?
Hey! Please any help on this problem! I am really stuck on this one. Any help would be great.
Use conservation of energy to determine the angular speed of the spool (shown in the figure linked below) after the 3.00 kg bucket has fallen 3.85 m, starting from rest. The light string atttached to the bucket is wrapped around the spool and does not slip as it unwinds. (Answer is in rad/s)
http://www.webassign.net/sercp/p8-36.gif
The potential energy lost by the bucket is Mbgh = 3*9.8*3.85
The moment of inertia for the spool is (I think) I = .5mr^2
All the potential energy goes into kinetic energy of the bucket and spool, so----
Ep = Ek = .5MbV^2 + .5 I w^2 where w = omega, angular vel of spool.
For V, substitute r*w and the eqn above will have only w and known factors in it, so you can solve it for w (rad/sec)
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