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Homework Help: Rotational Motion problem

  1. Mar 25, 2015 #1
    • Warning! Formatting template must be used in the homework sections!
    A 61 cm diameter wheel accelerated uniformly about its center from 120 rpm to 280 rpm in 4.0 seconds. Determine the Angular acceleration

    So I converted the 120 and 280 rev per min to radians per s with 45238.93 rad/s and 105557.51 rad/s and used them as angular velocity final and initial. then I subtracted the final from the initial and divided it by the time (4 sec)

    Equation used angular acceleration (fish) = change in angular velocity/time

    Answer gotten: 15 x 103 rad/s2 with sig figs.

    on the answer sheet= 4.2 rad/s2
  2. jcsd
  3. Mar 25, 2015 #2


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    Staff: Mentor

    Can you show your calculations for converting the given rpm values to radians per second? Your values look rather high.
  4. Mar 25, 2015 #3
    There is a problem with your conversion. Note that 1rpm=(2pi*1)/60 rad/s
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