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Homework Help: Finding Mass and Weight

  1. Sep 21, 2009 #1
    1. The problem statement, all variables and given/known data
    A horizontal wire is used to drag a crate at a constant velocity across a floor where the kinetic coefficient of friction is .35. If the wire will break under tensions exceeding 1000 Nt, find the mass and weight of the largest crate which can be moved. (Need help bad! Been figuring this problem out for almost an hour now!)

    2. Relevant equations
    Only one equation teacher gave me is Fs(max)=UsN
    Coefficient of Kinetic Friction state on my notes for this example. he made us copy that before class was dismissed and said use it on our h.w., figured 2/3 already.

    3. The attempt at a solution

    a) For mass: 1000 = (.35)(x)(9.8 m/s(2))
    x=292 Nt
    b) For Weight: X = (.35)(292 Nt)(9.8 m/s^(2))
    X = 1002

    I don't even know if this equation helps for this example because its not making sense to me! Can somebody please help! Thank You.
  2. jcsd
  3. Sep 21, 2009 #2
    a) You got the first equation right but your answer is in Kg.

    b) And the weight should be (mass) X (acceleration of gravity) =

    ( if I remember my mechanic correctly :)
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