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April 16, 2014

April 16, 2014

Posted by **Angela** on Monday, March 5, 2012 at 7:04pm.

Sorry - I would show some work but I have no clue how to even attempt this. Please help :(

- College Physics Help -
**Angela**, Monday, March 5, 2012 at 7:27pmNot sure how to apply the principle of conservation of mechanical energy.

- College Physics Help -
**drwls**, Tuesday, March 6, 2012 at 7:10pm(a) With no mass in the rod and all of the mass (M) at the top, the total kinetic energy just before it strikes the floor is

(M/2)V^2 = (M/2)(w*L)^2 = M g L

M cancels out, and the angular velocity w is

w = sqrt(2g/L) = 4.2 rad/s

(b) Just before impact, the mass atop the rod is accelerating at rate g. Angular acceleration before impact = a/L = g/L = 8.9 rad/s^2

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