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Rotating Record Problem

  1. Oct 23, 2008 #1
    A vinyl record is played by rotating the record so that an approximately circular groove in the vinyl slides under a stylus. Bumps in the groove run into the stylus, causing it to oscillate. The equipment converts those oscillations to electrical signals and then to sound. Suppose that a record turns at the rate of 33 rev/min, the groove being played is at a radius of 12.0 cm, and the bumps in the groove are uniformly separated by 0.161 mm. At what rate (hits per second) do the bumps hit the stylus?

    I am totally lost on this problem...please help me.
     
  2. jcsd
  3. Oct 23, 2008 #2

    LowlyPion

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    Welcome to PF.

    How fast is the stylus moving over the vinyl?

    If the bumps are registered at .161mm then how fast are they encountered at this speed?
     
  4. Oct 23, 2008 #3
    I don't know where to even start on this
     
  5. Oct 23, 2008 #4

    LowlyPion

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  6. Oct 23, 2008 #5
    3.49 rad/s I think
     
  7. Oct 23, 2008 #6
    oh thanks I finally figured it out with that help
     
  8. Oct 23, 2008 #7

    LowlyPion

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    No problem then.

    Cheers.
     
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