# mtIIsec1 - L i = L f thus mvr-MV R =-mvr MV R(3 which gives...

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Midterm 2 FAJANS Solution of Midterm 2, Problem 2 (by Haoyu) Solution 2 We assume the beam is heavy and apply the conservation of energy, in that case a stationary beam will result in the bounce back velocities are the same as the incoming velocities. Therefore, the inital angular momentum is L i = mvr - MV R (1) and the final angular momentum is L f = - mvr + MV R (2) again the stationary beam will result in conservation of angular momentum

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Unformatted text preview: L i = L f , thus: mvr-MV R =-mvr + MV R (3) which gives us: v V = MR mr (4) Comment ( Heavy beam assumption ): This assumption is not explicitly stated in the problem, if you do not use it, you will come up with “unable to specify the ratio v V ”. If you did that and say it’s not possible to ﬁnd v V , you can still get full credit. Otherwise you will lose some points. 1...
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