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Hunter-Best [27]
3 years ago
12

A disk rotates freely on a vertical axis with an angular velocity of 80 rpm . An identical disk rotates above it in the same dir

ection about the same axis, but without touching the lower disk, at 20 rpm . The upper disk then drops onto the lower disk. After a short time, because of friction, they rotate together. The final angular velocity of the disks is:______
A. 50 rpm
B. 40 rpm
C. 25 rpm
D. 20 rpm
E. 10 rpm
Physics
1 answer:
Nadya [2.5K]3 years ago
5 0
I think the answer is 40 rpm
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