exam 2 sp07

# exam 2 sp07 - Name _______________________________________...

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Name _______________________________________ Section Number ___________________ ENSC 2123 Exam 2 Spring 2007 1. (25 points) A particle moves in the horizontal, frictionless slot shown below (horizontal slot means ignore gravity). The angle θ is increasing at a constant rate of 0.70 radians per second. Determine the normal force the slot wall exerts on the particle when θ = 30 degrees. To save you some time, I’ve given you some of the data that you would have needed to calculate. At θ = 30 degrees: 33 . 0 = r meters, r = -0.0525 meters/s, r = -0.0637 meters/s 2

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Name _______________________________________ Section Number ___________________ 2. (25 points) If block B has an initial downward velocity of 3 meters per second when t = 0 seconds, determine the distance block B must travel to reach a speed of 15 meters per second downward. Note: you must use ENERGY or MOMENTUM to solve this problem. You may NOT use chapter 13 methods.

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Unformatted text preview: Name _______________________________________ Section Number ___________________ 3. (25 points) The 110 pound woman in the figure below is hanging motionless on a swing, while holding a 10 pound ball. She then throws the ball to her daughter and of course the impulse of the throw causes her to swing backwards, reaching a maximum angle of 12 degrees. How fast was the ball moving when her daughter caught it? Name _______________________________________ Section Number ___________________ 4. (25 points) Block A has a mass of 10 kg, and block B has a mass of 5 kg. The spring is initially unstretched; while block A has an initial velocity of 2 meters per second to the left and block B has an initial velocity of 6 meters per second to the right. Determine the maximum distance the spring stretches. (hint: at maximum spring stretch, the two blocks must have the same velocity)...
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## This note was uploaded on 04/10/2008 for the course ENSC 2123 taught by Professor Russell during the Spring '08 term at Oklahoma State.

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exam 2 sp07 - Name _______________________________________...

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