practice exam 2

# practice exam 2 - PHY107 SPRING 2007 EXAM 2 P1 Three blocks...

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PHY107 SPRING 2007 EXAM 2 P1. Three blocks are connected by two massless cords, one of which wraps around a frictionless pulley with negligible mass (see figure below). Block A can slide on the table without friction. The masses are m A =30.0 kg, m B = 40.0 kg, and m C =10.0 kg. The assembly is released from rest at t = 0. a. (3) Draw a free body diagram for m A . Clearly label the axes. Make the drawing separately and not on the figure given below (also applicable to parts b and c). b. (3) Draw a free body diagram for m B . Clearly label the axes. c. (2) Draw a free body diagram for m C . Clearly label the axes. d. (4) Write down Newton’s second law for m A in both x and y directions. e. (3) Write down Newton’s second law for m B . f. (3) Write down Newton’s second law for m C . g. (4) What is the acceleration a of A? h. (3) What is the tension T in the cord connecting B and C? Hint: The tensions in the two cords are generally not the same.

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P2. A roller coaster goes through a vertical circular section of the track (of radius R =
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practice exam 2 - PHY107 SPRING 2007 EXAM 2 P1 Three blocks...

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