Practice Final Exam

# Practice Final Exam - Problem 1. (25 points) A spring and...

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Problem 1. (25 points) A spring and plunger system launches a 0.5-kg ball of negligible size up a smooth vertical circular track. The spring is compressed 0.08 m by the plunger when s = 0. Assume that following release of the plunger, the spring returns to its initial compression equaling 0.08 m. (a) Determine how far s must the plunger be pulled back and released if the ball begins to leave the track when θ = 135 ° . (b) Determine how far s the plunger must be pulled back and released so that the ball will just make it around the loop (point B) . (c) Based on your calculation in part b, what is the ball’s speed (magnitude of velocity) when it first hits the platform. Answers: Part (a) Distance s Part (b) Distance s Part (c) Speed of ball B A 0.5 m

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Name 2 Problem 2. (25 points) The figure illustrates a commonly used quick-return mechanism which produces a slow cutting stroke of the tool (attached to D) and a rapid return stroke. If the driving crank OA
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## This note was uploaded on 04/08/2010 for the course MECHENG 240 taught by Professor Perkins during the Fall '09 term at University of Michigan.

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Practice Final Exam - Problem 1. (25 points) A spring and...

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