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Homework Help

  1. Oct 18, 2007 #1
    Homework Help!!

    1. The problem statement, all variables and given/known data
    Gloria, who has mass 60. kg, is skiing on the famous frictionless ski slopes. The slope is making an angle of 30o with the horizontal. How fast, in m/s, will Gloria be going after 10 seconds on the slope?

    2. Relevant equations
    d = v x t vavg = ½ (vf + vi) vf = at + vi
    a = (vf - vi) / t d = vi t+ ½ at 2 vf2 = vi2 + 2ad
    d = (vf2 - vi2)/2a
    F = ma
    Elevator Problems: Fnet = Fapplied + Fgravity
    Force at an angle and skier problems: SOHCAHTOA
    g = acceleration due to gravity = -10 m/s2;

    3. The attempt at a solution
    I Identified:

    Mass= 60
    Time = 10 seconds
    Angle = 30 degrees

    Then here's my attempt:

    Fapplied = cos(60) = Fapplied/600N

    Fapplied = 300N

    Now what?

    Please Help ASAP!
  2. jcsd
  3. Oct 18, 2007 #2
    Anyone Out There To Help!!!
  4. Oct 18, 2007 #3


    User Avatar
    Gold Member

    Glorias going down a slope, so you'll need to know the component of her weight that is actually acting on her, once you've resolved this component, you can treat it as linear system so your equations of motion become valid. How exactly then would you go about getting the velocity? You know the time . . .
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