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Homework Help: Help with two problems

  1. Sep 26, 2004 #1
    In Figure 5-50, three ballot boxes are connected by cords, one of which wraps over a pulley having negligible friction on its axle and negligible mass. The masses are mA = 22.0 kg, mB = 40.0 kg, mC = 18.0 kg.

    Fig. 5-50

    (a) When the assembly is released from rest, what is the tension in the cord that connects boxes B and C?
    (b) How far does box A move in the first 0.250 s (assuming it does not reach the pulley)?

    and the other is

    Figure 5-55 shows three blocks attached by cords that loop over frictionless pulleys. Block B lies on a frictionless table; the masses are mA = 7.00 kg, mB = 8.00 kg, mC = 10.5 kg. When the blocks are released, what is the tension in the cord at the right?

  2. jcsd
  3. Sep 26, 2004 #2


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    What have you tried? What are the forces acting on each of the blocks on the x-axis and y-axis?
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