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Flywheel torque problem

  1. Mar 8, 2010 #1
    1. The problem statement, all variables and given/known data

    The flywheel of a steam engine runs with a constant angular speed of 375 rev/min. When steam is shut off, the friction of the bearings stops the wheel in 1.8 h.

    At the instant the flywheel is turning at 75 rev/min, what is the tangential component of the linear acceleration of a flywheel particle that is 50 cm from the axis of rotation?

    Angular Acceleration: -3.47 rev/(min^2)

    2. Relevant equations

    Tangential component of the linear acceleration = (angular acceleration)(radius to object)

    3. The attempt at a solution

    I tried dividing the angular acceleration figure by 60 to make it in rev/(sec^2), then multiplied by r (.5 m), and ended up with the wrong answer. I tried multiplying that angular acceleration figure by 2pi to convert it to radians then multiplied it out, but still no dice. I have one attempt left. Do I need to clarify anything?
  2. jcsd
  3. Mar 8, 2010 #2


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    The units are rev/min2. 1 revolution is 2π rad and 1min2 is 3600s2, so you need to multiply rev/min2 by 2π/3600 to get it into rad/s2
  4. Mar 8, 2010 #3
    ah, so I was close. thanks.
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