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Homework Help: Brain cramp and need equation

  1. Jan 31, 2008 #1
    1. The problem statement, all variables and given/known data

    Young David who slew Goliath experimented with slings before tackling the giant. He found that he could revolve a sling of length 0.750 m at the rate of 10.0 rev/s. If he increased the length to 1.050 m, he could revolve the sling only 8.00 times per second.

    What is the speed of the stone for each rate of rotation?

    a) .... m/s at 10.0 rev/s

    b) .... m/s at 8.00 rev/s

    3. The attempt at a solution

    I can probably figure this out but I forgot my book and don't want to guess. Please could you tell me the equation that I use.

  2. jcsd
  3. Jan 31, 2008 #2
    It is most likely the relationship between angular movement and tangential.
    [tex]V_t=r \cdot\omega[/tex]

  4. Jan 31, 2008 #3
    Thanks, I got it.

    I just took the circumference and multiplied that by the rotations/sec.
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