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exam 3 f07 - Name and Discussion Section Number ENSC 2123...

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Name and Discussion Section Number _______________________________________ ENSC 2123 Exam 3 Fall 2007 1. (25 points) A ball bounces down the steps as shown in the figure below. On each bounce, the ball reaches the same height h’ above the step as shown. If the step height h is 6 inches, and the coefficient of restitution is 0.8, determine the bounce height, h’. (Hint: at each step, the ball falls a distance ( h + h’), and rebounds a distance h’ ).
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Name and Discussion Section Number _______________________________________ 2. (25 points) The motor, pulley and belt system shown below produces a constant torque of 20 newton-meters, about the center of the large disk/pulley (D-C), in the same direction of the motor. If the system starts from rest, determine the velocity of block B after it has risen 0.5 meters. The large disk has a mass of 40 kg, and block B has a mass of 10 kg.
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