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Homework Help: Easy friction question

  1. Oct 11, 2007 #1
    1. The problem statement, all variables and given/known data

    A block of mass m = 2.20 kg rests on the left edge of a block of larger mass M = 6.90 kg. The coefficient of kinetic friction between the two blocks is 0.310, and the surface on which the 6.90 kg block rests is frictionless. A constant horizontal force of magnitude F = 19.20 N is applied to the 2.20 kg block, setting it in motion as shown in the figure, part (a) . If the distance L that the leading edge of the smaller block travels on the larger block is 3.60 m, how long will it take before this block reaches the right side of the 6.90 kg block, as shown in the figure, part (b)? Use g=9.81 m/s2 as usual.

    <img src ="http://capa.mcgill.ca/res/mcgill/dcmcgill/oldproblems/mcgilllib/Kilfoil/graphics/p5_65.jpg">

    How far does the 6.90 kg block move in the process?

    2. Relevant equations

    Ffriction = (mu)Fn
    F = ma

    3. The attempt at a solution

    I got 1.13s, but it says it's wrong

    second one..well i need first solution to solve..

    I got .548 m with 1.13s...
  2. jcsd
  3. Oct 11, 2007 #2
    Oops, I got the answer..kk FYI answers were 1.24 s and .740 m.
  4. Oct 15, 2010 #3
    Can you show step by step of how you did the question?:smile:
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