Quiz6_key - A to B . ______ 143 J _________ (b) Find the...

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PHYS 2305 CHANG: Quiz 6, Spring 2009 Name (print)___________________ KEY ____________________________ I have neither given nor received any unauthorized aid on this quiz. Pledge ______________________________________________ Instructions : Show your work to receive credit , and present your answers with 3 significant figures and proper units . 1. A linear spring ( k = 2400 N/m) with an unstretched length of 1.3 m is attached to the 40 Kg block as shown. A constant horizontal force F = 150 N is applied on the block as the block moves from A to B along the 30° ramp. The coefficient of friction on the surface is μ k = 0.3 between the block and the incline. (a) Find the work done by the applied force F on the block from
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Unformatted text preview: A to B . ______ 143 J _________ (b) Find the work done by gravity on the block from A to B . _______ 216 J _________ (c) Find the work done by friction on the block from A to B . _______ 137 J ___________ (d) Find the work done by the spring on the block from A to B . _______ 132 J __________ 30 B 0.7 m 1.8 m F A 2. Automotive power (a) If 12 kW power is required to drive a 1500 Kg car at a constant speed of 25 m/s on a level road, what is the total retarding force (friction, air resistance, and so on) on the car? _________ 480 N __________ (b) What power (in kW) is required to drive the same car at a constant speed of 25 m/s up a 10% grade? ________ 48.6 kW _________...
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