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Proportional ratios with exponents - Need Help

  1. Oct 15, 2012 #1
    proportional ratios with exponents - Need Help!!

    A walker's speed, v, is proportional to the ratio of his leg length, L, and the period of the repeating motion of his legs, T, that is, v ∝ L/T. If the period is measured to be proportional to Lp, where p = 4/5, what power of L must the speed be proportional to?



    I have absolutely no idea how to do this problem. I've tried it a couple times and I'm getting no where with it. Please help!!! The more you could explain the answer the more helpful it would be as well!
     
  2. jcsd
  3. Oct 15, 2012 #2

    tiny-tim

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    welcome to pf!

    hi kathleenhelen! welcome to pf! :smile:
    that doesn't make sense :confused:

    do you mean the period is measured to be proportional to L4/5 ?
     
  4. Oct 15, 2012 #3
    Re: proportional ratios with exponents - Need Help!!

    Yes! Sorry, I mistyped the question by accident, but the 4/5 is supposed to be an exponent.
     
  5. Oct 15, 2012 #4

    tiny-tim

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    ok, v ∝ L/T means v = aL/T for some constant a

    similarly T = bL4/5 for some constant b

    so v = … ? :smile:
     
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