quiz4sol - October3,2007 PHY2053 Quiz4(Section4.6,5.15.3)...

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October 3, 2007 PHY2053  Quiz 4 (Section 4.6, 5.1-5.3) Name:                                   UFID: 1. (5 pts) A 5.00 kg block is resting on an incline of 30.0º. When you push the block  vertically down with 30.0 N, it starts to slide down. Find the acceleration of the block.  The coefficient of kinetic friction between the incline and the block is 0.400. Taking +x direction downhill and +y perpendicular to the incline, we express each force   acting on the block in components: Fex = (30sin30º, -30cos30º) = (15N, -26.0N) Fg = (mgsin30º, -mgcos30º) = (24.5N, -42.4N) n = (0, mgcos30º+30cos30º) = (0N, 68.4N) f = (-μn, 0) = (-27.4N, 0N) Fx = 15+24.5-27.4 = 12.1N, a =  Fx/m = 2.42 m/s² Σ Σ You only need x-components of the forces to solve the problem, but it’s important to write   down the y-components and make it sure they add up to zero. 2. (5 pts) A crate of mass 5 kg rests on a horizontal table and is connected to a light 
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This note was uploaded on 12/13/2011 for the course PHY 2053 taught by Professor Buchler during the Fall '06 term at University of Florida.

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quiz4sol - October3,2007 PHY2053 Quiz4(Section4.6,5.15.3)...

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