154-wk-08 - HPHY 154 Workout 08 Work Prof. A. E. Bak Name...

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HPHY 154 Workout 08 Work Prof. A. E. Bak Name Work is the effect of force acting over displacement. For a force f acting over a path C of displacement, the work W done is defined by W ! " C f ! dl , where dl is an infinitesimal displacement along C . For a constant force acting over a displacement D , this definition yields simply W ! f ! D ! fD cos ! , where ! is the tail-to-tail angle between f and D . 1. 35.0-N force directed at an angle of 25.0 # below the horizontal. Find the work done by the shopper as he moves down an aisle 50.0 m long. 2. In order to push a 25.0- kg crate up a frictionless incline, angled at 25.0 # to the horizontal, you exert a 209-N force parallel to the incline. As the crate slides 1.50 m , what work is done on the crate by: a. you. b. the gravitational force. c. the normal force exerted by the incline. 3. P 7.20 (on page 211), a small mass m is pulled to the top of a frictionless half-cylinder of radius R by a cord that passes over the top of the half-cylinder. a. If the mass moves at constant speed, then show that f ! mg cos ! . Hint: The tangential acceleration a s is zero here. b.
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This note was uploaded on 06/03/2008 for the course PHYSICS 111 taught by Professor Stevens during the Spring '08 term at Morehouse.

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154-wk-08 - HPHY 154 Workout 08 Work Prof. A. E. Bak Name...

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