Solved: A disk rotates freely on a vertical axis with an angular velocityof 30 rpm. An
Chapter 9, Problem 27(choose chapter or problem)
A disk rotates freely on a vertical axis with an angular velocityof 30 rpm. An identical disk rotates above it in the samedirection about the same axis, but without touching the lowerdisk, at 20 rpm. The upper disk then drops onto the lower di sk.After a short time, because of friction , they rotate together. Thefi nal angular velocity of the disks isA. 50 rpmB. 40 rpmC. 25 rpmD. 20 rpmE. 10 rpm
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