Physics, 12.02.2020 05:29 smilingntn33p7pqpp
A disk rotates freely on a vertical axis with an angular velocity of 50 rpm . An identical disk rotates above it in the same direction 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 is1. 49 rpm2. 21 rpm3. 77 rpm4. 35 rpm5. 42 rpm
Answers: 1
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A disk rotates freely on a vertical axis with an angular velocity of 50 rpm . An identical disk rota...
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