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Homework Help: Find moment of inertia for a door

  1. Apr 20, 2009 #1
    1. A uniform, thin solid door has a height 2.20 m, width 0.870m, and mass of 23.0 kg. Find its moment of inertia for rotation on its hinges. Is any piece of data unneccessary?

    2. A grinding wheel is in the form of a uniform solid disk of radius 7.00 cm and mass of 2 Kg. It starts from rest and accelerates uniformly under the action of the constant of torque of 0.6000 NxM that the motor exerts on the wheel.
    How long does it take for the wheel to reach its final operating speed of 1200 rev/min ? Through how many revolutions does it turn while accelerating?

    Would appreciate any help! Seems easy, but I can't figure it out..like the equation I need to use :confused:
  2. jcsd
  3. Apr 20, 2009 #2


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    Homework Helper

    Re: rotation/torque

    Looks like you need to start with what the definition is for the moment of inertia.
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