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Angular motion-centrifuge problem please help.

  1. Apr 8, 2015 #1
    1. The problem statement, all variables and given/known data: A centrifuge starts from rest and speeds up at 3400rpm after 50 seconds.

    a sample is at a distance of 37.5mm from the centre

    1) find the angular acceleration
    2) calculate the centripetal acceleration


    2. Relevant equations:

    v2 / r

    v = rω

    a = rω2

    a=Λω/Λt

    3. The attempt at a solution

    1) a=Λω/Λt = 3400/60*2∏/50 = 7.12 rad/sec^2

    2) ac =v^2/ r = 7.12/ 0.01875 ( 0.01875 is the radius converted to M)
     
  2. jcsd
  3. Apr 8, 2015 #2
    The distance from the center of the circle to a point on the circumference of the circle is the radius of the circle. So wouldn't the radius of the circle be 37.5mm? Which, converted to meters, is .0375?
     
    Last edited: Apr 8, 2015
  4. Apr 8, 2015 #3

    BvU

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    In addition: ##v^2## is not 7.12 rad/s2
     
  5. Apr 8, 2015 #3

    BvU

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    In addition: ##v^2## is not 7.12 rad/s2
     
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