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July 31, 2014

Homework Help: school

Posted by Aaron on Wednesday, October 30, 2013 at 10:35am.

Two disks are spinning freely about axes that run through their respective centres (see figure below). The larger disk
(R1 = 1.42 m)
has a moment of inertia of 1180 kg m2 and an angular speed of 4.0 rad/s. The smaller disk
(R2 = 0.60 m)
has a moment of inertia of 906 kg m2 and an angular speed of 8.0 rad/s. The smaller disk is rotating in a direction that is opposite to the larger disk. The edges of the two disks are brought into contact with each other while keeping their axes parallel. They initially slip against each other until the friction between the two disks eventually stops the slipping. How much energy is lost to friction? (Assume that the disks continue to spin after the disks stop slipping.)

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