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Sample_Exam_2

# Sample_Exam_2 - Name and Discussion Section Number ENSC...

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Name and Discussion Section Number ________________________________________ ENSC 2123 Exam 2 Fall 2010 Question 1 (25 Points): The 3kg collar slides along the smooth vertical spiral rod. Determine the tangential force that must be propelling the collar and the normal force between the road and the collar. At ߠ ൌ radians: ݎ ൌ 3.142 meters, ݎ ሶ ൌ 8 meters/s, ݎ ሷ ൌ 0 meters/s 2 , ߠ ൌ 4 rad/s and is constant.

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Question 2 (25 Points): Block A weighs 20 pounds, and block B weighs 5 pounds. If block B has an initial downward velocity of 3 feet per second, when ݐ ൌ 0 seconds, determine the distance block B must travel before it momentarily comes to a stop. Note: you must use ENERGY or MOMENTUM to solve this problem. You may NOT use chapter 13 methods.