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Homework Help: Static question

  1. Nov 23, 2008 #1
    1. The problem statement, all variables and given/known data

    a car is exerting 3.000N of force on a hill that rises 3m for each 100m of road. what is the actual weight of the car? how much force do the brakes have to exert to keep the car from rolling down the hill.

    2. Relevant equations

    a2 + b2 = c2
    sin theta= opp/hyp
    cos theta=adj/hyp
    tan theta=opp/adj

    3. The attempt at a solution

    i used the a2 + b2 =c2 equation and found that c is 100.04m
    I assumed that 3m is the height = a
    100m is the length so its = b
    and thats how i found c is the side of the hill
    i tried cutting the problem into smaller triangles to get the degrees of the hill from the ground to try to get the answr easier, but im not sure...
    thank you for all the help.....
  2. jcsd
  3. Nov 24, 2008 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Is that 3N or 3000N? You will need trigonometry to fiind the angle of the hill and then you will need to split the cars weight into components. Try drawing a free body diagram before hand.
  4. Nov 24, 2008 #3
  5. Nov 24, 2008 #4


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    Staff Emeritus
    Science Advisor
    Gold Member

    So have you tried anything yet?
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