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May 28, 2015

Homework Help: Physics

Posted by Elizabeth on Friday, November 16, 2012 at 2:34pm.

Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.8 kg m2 and an angular velocity of +6.7 rad/s. Disk B is rotating with an angular velocity of -8.9 rad/s. The two disks are then linked together without the aid of any external torques, so that they rotate as a single unit with an angular velocity of -2.3 rad/s. The axis of rotation for this unit is the same as that for the separate disks. What is the moment of inertia of disk B?

Answer in kg*m2

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