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Unformatted text preview: Problem 1. (32 points) Answer the following questions and give brief explanations for your answers . Just stating the answer without explanation is not sufficient. Note, there are also questions on the back of this page. Answer all the parts! Each question is worth 4 points unless stated otherwise. (a) Two identical disks, A and B , roll across a floor with equal speeds. Disk A then rolls up an incline without slipping, reaching a height h . Disk B moves up an incline that is identical except for the fact that it is frictionless. Is the maximum height that disk B reaches greater than, less than, or equal to h ? A B CM (b) A uniform block is suspended by two wires, A and B , which are identical except for their initial lengths. The center of mass of the block is closer to wire B than wire A as shown in the figure at the right. (1) Which wire exerts a larger force on the block? (2) If the two wires end up the same length, which one started out shorter? (c) A 100 kg mass is suspended by a steel wire with diameter 6 . 0 mm and length 10 m. You measure that the wire stretches 1 . 6 mm under this load. What is Youngs modulus for the steel used in this wire?steel used in this wire?...
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This homework help was uploaded on 04/08/2008 for the course PHYS 121 taught by Professor Kernan during the Spring '08 term at Case Western.
 Spring '08
 kernan
 mechanics

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