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Homework Help: Angular Acceleration

  1. Nov 18, 2006 #1
    The problem is:

    The angular speed of a propellor on a boat increases with constant acceleration from 50 rev/min to 150rev/min in 2.5s.What is the angular acceleration of the propellor?

    I'm not sure how to go about the problem.So far I've converted the 50rev/min and the 150rev/min to rad/s.Do I have to work out wf-wi and tf-ti or am I going about it wrong?
    Last edited: Nov 18, 2006
  2. jcsd
  3. Nov 18, 2006 #2

    Doc Al

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    Staff: Mentor

    Sounds like you are on the right track.
  4. Nov 19, 2006 #3
    Kinematic equations can be applied to translational motion with constant acceleration. The same works in rotational dynamics. In fact, the equations for both types of motion share a common format with different variables. Given an initial and final angular speed during some time interval, what is the acceleration? If you're still unsure, ask yourself, "How would I solve if the variables were dimensionally linear?" Is there a similar rotational equivalent?
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