1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Homework Helper

    What have you tried? What are the forces acting on each of the blocks on the x-axis and y-axis?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook