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Homework Help: Constant torque

  1. Apr 2, 2016 #1
    1. The problem statement, all variables and given/known data
    A yo-yo has a moment of inertia of 75.0 g-cm2 about its rotation axis. What is the constant torque required to make it spin to 300 rev/min in one second, starting from rest?

    2. Relevant equations
    81a69207104f00baaabd6f84cafd15a0.png = Iα

    3. The attempt at a solution
    I was thinking since the question is asking for constant torque, angular acceleration would also have to be constant. Therefore, I would just find angular acceleration (using (ω(t) - ω0)/(t2-t1)) then multiply that angular acceleration by the moment of inertia. Is that correct thinking?
  2. jcsd
  3. Apr 2, 2016 #2


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    Gold Member
    2017 Award

    Yes, your thinking is correct. Be careful with the units.
  4. Apr 3, 2016 #3
    What did you get as your answer for this?
  5. Apr 4, 2016 #4
    2.36 x 10^-4 kg*m^2/s^2
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