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Unformatted text preview: February 15, 2008 PHY2053 Discussion Quiz 4 (Chapter 4.1-4.5 & 5.1-5.2) Name: UFID: **1. (5 pts) A 4.00 kg block lies on a 45 incline and is attached to a light string that passes over a pulley and is then fastened to an 8.00 kg hanging object. The coefficient of kinetic friction between the incline and the block is 0.25. Find the acceleration of the block. Taking the positive x-axes in the directions of motion, the equations of motion for the block and the hanging object are ma = T-mgsin -mgcos Ma = Mg-T. To remove T, we add these two equations and solve for the acceleration: (m+M)a = Mg- mgsin -mgcos a = (Mg- mgsin -mgcos )/(m+M) = 9.8 (8-4sin45-0.25 4cos45)/12 = 3.65 m/s **2. (5 pts) A 2.00 kg block lies on the left edge of a plank which has a length of 3.00 m **2....
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