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Homework Help: Angular momentum about an origin (O,O,O)

  1. May 3, 2012 #1


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    1. The problem statement, all variables and given/known data

    Calculate the angular momentum about the origin O=(0,0,0) of a particle of mass m moving
    along the following two trajectories:

    (a) x(t)=vt y(t)=b z(t)=0
    (b) x(t)=Rcos(wt) y(t)= Rsin(wt) z(t)=vt

    2. Relevant equations
    L = r x p
    L = mvr

    3. The attempt at a solution

    I wasn't really sure to begin. I thought maybe I could do
    L= m(vxr)
    L=m ( (mv,0,0)x(vt...) Not sure what the vector equation for P is and also not sure what to do about the mass

    Please help!
  2. jcsd
  3. May 3, 2012 #2


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    Any help is GREATLY appreciated D: Kinda urgent
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