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Homework Help: Finding applied force

  1. Mar 18, 2012 #1
    1. The problem statement, all variables and given/known data

    a 79kg mass can slide down a slope of 57 degrees at a constant speed of 12km/h/ how much average force must be abpplied to climb the hill at the same speed?

    2. Relevant equations

    Ef=ma
    Ef=Fapp-Fgsintheta


    3. The attempt at a solution

    ............ughm.... kinda dont know how to start.....?
    but kk.. Fapp=Fgx+Ffs
    but.. idk what mui is in Ffs...
    so maybe.. Ffs = Fgx going down?

    I don't know where to include the speed though...
     
    Last edited: Mar 18, 2012
  2. jcsd
  3. Mar 18, 2012 #2
    Sorry, but forum rules state that we need to see an attempt at a solution first before we're allowed to help.
     
  4. Mar 18, 2012 #3
    lol woops :$
     
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