Dynamics Exam 2 Solutions

Dynamics Exam 2 Solutions - Name:_KEY_ Last First UNLV,...

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Name:________ KEY _______ Last First UNLV, DEPARTMENT OF MECHANICAL ENGINEERING ME 242, SPRING 2009, Second TEST Closed Book, one page of handwritten notes allowed. Enter the answer for each question into the space provided. Enter SI units in all answer spaces with brackets ( ). 1. (15 points) The mass (m = 10 kg) is released from rest at A on a frictionless surface. Determine (a) the velocity at point B (7 points) (b) The total reaction force at B (8 points) Use energy method, Datum at B (a) V1 = T2 m*g*h = 0.5*m*v B 2 Æ v B =sqrt(2gh) = 4.43 m/s B (b) Total reaction at B is N B = mg + mv /r B 2 N B = 10*(9.81+ 19.62/0.5) = 495 N B Answer v B = 4.43 m/s v B B B = 6.26 m/s N B = 495 N N B B B = 264 N 2. (20 points) Point masses A and B are linked by a pulley and released from rest as shown, with B positioned at 1.5 m above ground while gravity is present. (a) Draw a free body diagram of the system. Use the back of the page for the diagram. Answer a: at left (b) Determine the time at which mass B hits the
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Dynamics Exam 2 Solutions - Name:_KEY_ Last First UNLV,...

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