exam 3 sp07

# exam 3 sp07 - acceleration of block A Both blocks weigh 5...

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Name and Discussion Section Number _______________________________________ ENSC 2123 Exam 3 Spring 2007 1. (25 points) In the figure shown below, Blocks A and B are attached by ropes to the double pulley. Block B is released from rest. When block B has moved 3 ft downward, it is traveling at a velocity of 4 feet per second. Determine the acceleration of block A. (Note: no masses are given, because they are not needed.) r1 = 0.75 ft and r2 = 1.5 ft B A r2 r1

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Name and Discussion Section Number _______________________________________ 2. (25 points) In the figure shown below, at the instant shown, determine the velocity of the center of wheel B.
Name and Discussion Section Number _______________________________________ 3. (25 points) In the figure shown below, Blocks A and B are attached by ropes to the double pulley, and everything is initially at rest. If block B is released and allowed to fall, determine the

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Unformatted text preview: acceleration of block A. Both blocks weigh 5 pounds, and the double pulley weighs 10 pounds. r1 = 0.75 ft, r2 = 1.5 ft and the radius of gyration (k) for the double pulley is 0.6 ft. (remember: I = m k 2 ) B A r2 r1 μ =0.15 k Name and Discussion Section Number _______________________________________ 4. (25 points) In the figure below, block B is attached to the spring, the spring is initially compressed a distance d = 0.75 ft., and both blocks are at rest. (Note: if the spring were slowly relaxed, blocks A and B would be touching.) Block B is released, and is propelled by the spring, and collides with block A. Determine the speed of block A immediately after the collision. Block A weight 10 pounds, Block B weighs 5 pounds, and the spring stiffness, k, is 25 pounds per foot....
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exam 3 sp07 - acceleration of block A Both blocks weigh 5...

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