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exam 2 f07

# exam 2 f07 - Name ENSC 2123 Exam 2 Fall 2007 1(25 points A...

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Name _______________________________________ ENSC 2123 Exam 2 Fall 2007 1. (25 points) A circus acrobat has a weight of 180 pounds, and is strapped to an inverted swing (a seat on a massless, rigid, 10 foot long pole that rotates freely, in a vertical plane, about point O) as shown in the figure below. Because he is strapped to the seat, he cannot fly out of the seat. When θ = 0, the man’s speed is 15 feet per second toward the left. Determine the force in the pole when he reaches θ = 80 degrees. Be sure to state whether the pole is in tension or compression. Note: you must use either work-energy or impulse momentum in this problem. You may not use a ds = v dv!

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2. (25 points) Block A has a mass of 10 kg and is initially at rest. The rope at point B is pulled downward with a steady force of 50 newtons. Determine the speed of block A when the rope has been pulled downward 3 meters. Note: you must use either work-energy or impulse momentum in this problem. You may not use a ds = v dv!
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exam 2 f07 - Name ENSC 2123 Exam 2 Fall 2007 1(25 points A...

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