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Homework Help: Calculate cangular momentum vector L

  1. Jun 23, 2012 #1
    1. The problem statement, all variables and given/known data

    calculate the angular momentum vector L

    2. Relevant equations

    r = rr(hat) r=√(xsquared + y squared) r(hat) = <cosθ, sinθ>
    v = r(dot)r(hat) + rθ(dot)θ

    3. The attempt at a solution
    L = mv X r

    I dont know m, how can i calcuate L? please help me
  2. jcsd
  3. Jun 24, 2012 #2


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    welcome to pf!

    hi classicphysic! welcome to pf! :smile:
    yes, you do need m!

    so just call it "m", and leave it in the answer :wink:
  4. Jun 24, 2012 #3
    i am waiting for the help people...checking it every hour but no body answers it
  5. Jun 24, 2012 #4
    tiny-tim answered you already!

    What more do you need?

    And I really don't think this counts as "Advanced Physics". So, wrong forum?
  6. Jun 24, 2012 #5


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    hi classicphysic! :smile:
    posting it when the americans are about to go to bed, and the europeans are fast asleep :zzz:, isn't the best time, if you want a quick answer :wink:

    (and posting it in the right forum would make it more likely that the right people see it)

    btw, you don't need to keep checking … you should receive an email notification of each new post in any thread you've posted in :smile:
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