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Homework Help: Physics help

  1. Oct 20, 2004 #1
    physics help!!!

    :confused: Ok, I have understood every problem we have done so far except this one,

    You are wearing shoes that have a coefficient of friction on rock of 0.70. On how steep a rock slope could you stand without slipping?

    So far i have gotten:
    Fs=Fparallel=
    mu*W*costheta = W*sinTheta
    w=mg

    but if u cancel weights I got:
    mu*costheta = sintheta

    Im probably completely wrong, but thats what i got.
    Thanks in advance.
     
  2. jcsd
  3. Oct 20, 2004 #2

    Pyrrhus

    User Avatar
    Homework Helper

    Last edited: Oct 20, 2004
  4. Oct 20, 2004 #3
    well i guess my problem is solving the trig cause i simplified to what he got on that similar problem
     
  5. Oct 20, 2004 #4

    Doc Al

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    Staff: Mentor

    Looks good to me. The friction force must equal the parallel component of the weight. Good!

    Now keep going: [itex]\mu cos\theta = sin\theta[/itex] ==> [itex]tan\theta = \mu[/itex]. Now solve for [itex]\theta[/itex]. (Use your calculator.)
     
  6. Oct 20, 2004 #5
    ohhh alright i got it, thank you very much
     
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