PHY2048_09-28-09 - Phy2048 Spring 2008 Review Exam • Q20...

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Unformatted text preview: Phy2048 Spring 2008 Review Exam • Q20 • Q19 • Q17 • Q16 • Q13 • Q12 • Q10 • Q8 • Q5 • Q2 Forces on the puck: 1) F y,net = F N- F g = 0 --> F N = F g = mg 2) F x,net = - f k = ma x 3) f k = μ k F N = μ k mg 4) -( μ k mg) = ma x--> μ k = - ma x /mg = - a x /g 5) a x = - 0.61 m/s 2 μ k = - (-0.61 m/s 2 )/(9.81 m/s 2 ) = + 0.0622 Q17: The speed of a 0.41 kg hockey puck, sliding across a level ice surface, decreases at the rate of 0.61 m/s 2 . The coef¡cient of kinetic friction between the puck and ice is: F g F N f k v Forces on B: 1) F y,net = T - m B g = ma yB = 0 --> T = m B g Forces on A: 2) F y,net = F N- F g,A cos θ = ma yA = 0 --> F N = m A g cos θ 3) F x,net = T - f s,max- F g,A sin θ = ma xA = 0 -->T = f s,max + F g,A sin θ 4) f s,max = μ s F N = μ s m A g cos θ 5) T = μ s m A g cos θ + m A g sin θ = m A g( μ s cos θ + sin θ ) Back to Eqtn 1) T = m B g = m A g( μ s cos θ + sin θ ) 6) m B = m A ( μ s cos θ + sin θ ) = (10 kg)[0.4 cos(35°) + sin(35°)] = 9.0 kg Spring 08, Exam 1: Q19 A B F g,A T T F g,B f s N !...
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This note was uploaded on 02/12/2010 for the course BCN 1210 taught by Professor Fobair during the Spring '09 term at University of Florida.

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PHY2048_09-28-09 - Phy2048 Spring 2008 Review Exam • Q20...

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