Oniline Physics PS11_rev1.1

Oniline Physics PS11_rev1.1 - Online Physics PS 11 Work and...

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Online Physics PS 11 – Work and Energy, Conservation of Mechanical Energy, Work done by Dissipative Forces 1. A block of mass 2.50 kg is at rest on a frictionless floor. A cord is tied to the block and the block is pulled to the right with the cord parallel to the floor. The tension in the cord is 56.0 N. a. Draw the freebody diagram of the block. b. What is the work done by the tension on the block if the block displaces 1.0 m? c. What is the work done by the weight of the block as the block displaces 1.0 m? d. What is the work done by the normal force on the block as the block displaces 1.0m? e. What is the velocity of the block after it has displaced 1.0 m? (Use the work energy theorem) 2. The block in problem 1 is returned to its starting position and the cord is handed to a much taller person. Now when the block is pulled the cord makes an angle of 60 o with the + x axis. Given that all other parameters are the same: a. Draw the new freebody diagram of the block. b. Determine the work done by the y component of the tension on the block if the block displaces 1.0 m in the +x direction. c.
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This note was uploaded on 07/20/2010 for the course PHYS 303 taught by Professor Mr.syed during the Spring '10 term at Franciscan OH.

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Oniline Physics PS11_rev1.1 - Online Physics PS 11 Work and...

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