hour 401 - University of Minnesota Names: School of Physics...

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Unformatted text preview: University of Minnesota Names: School of Physics and Astronomy Physics 1301, Section 200, Fall 2008 Hour Exam 4: Group Problem (Thursday, November 20, 2008) Two blocks are connected together by a strong, but very light string passing over a pulley as shown in the diagram below. Block 1 has a mass of 5.00 kg. It rests on a surface that is inclined at 10.0 above the horizontal. The coefficient of kinetic friction between Block 1 and the surface on which it rests is 0.200. Block 2 is suspended vertically. It has a mass of 20.0 kg. The pulley is a uniform, solid disk with a mass of 0.500 kg and a radius of 0.100 m. The string does not slip on the pulley. The blocks and the pulley are initially at rest and at time t = 0, they are allowed to move. (a) What is the work done by friction when Block 1 moves a distance x along the inclined plane on which it rests? (5 points) (b) What is the kinetic energy of the pulley when it turns at an angular velocity ? (5 points) (c) After Block 2 has fallen by 1.00 m, what is its velocity? (10 points) (d) How long does it take for Block 2 to fall 1.00 m? ...
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