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So fustrated and need some desperate help

  1. Oct 12, 2007 #1
    all,
    i am stuck on this problem. physics has not been good to me this semester. its like "in one ear out the other"

    this is the problem:
    [​IMG]

    i cant get c or d.

    for c i tried .25(29*9.8+117.37*sine(40)) that wasnt right

    for d i tried 117.37*4.1 and that wasnt right

    please help me.
     
  2. jcsd
  3. Oct 12, 2007 #2

    learningphysics

    User Avatar
    Homework Helper

    For part c), you forgot to multiply by the distance... also the work by friction is negative...

    Think about this... the crate is moved at constant velocity... so what is the net work done on it by all forces? (what does the work energy theorem say?)
     
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