7. Two discs are initially spinning in opposite directions. The upper disc has rotational inertia of 10kgm? and a rotation rate of 12rad/s. The lower disc has rotational inertia of 25kgm² and a rotation rate of 8rad/s. The upper disc is dropped onto the lower disc and they stick together. What is the rotation rate AND direction of the two disc system?

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter13: Rotation Ii: A Conservation Approach
Section: Chapter Questions
Problem 10PQ: Suppose a disk having massMtot and radius R is broken intofour equal parts (Fig. P13.10).What is the...
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7. Two discs are initially spinning in opposite directions. The upper
disc has rotational inertia of 10kgm² and a rotation rate of 12rad/s.
The lower disc has rotational inertia of 25kgm? and a rotation rate of
8rad/s. The upper disc is dropped onto the lower disc and they stick
together. What is the rotation rate AND direction of the two disc
system?
Disk 2
Disk 1
(a)
(b)
Transcribed Image Text:7. Two discs are initially spinning in opposite directions. The upper disc has rotational inertia of 10kgm² and a rotation rate of 12rad/s. The lower disc has rotational inertia of 25kgm? and a rotation rate of 8rad/s. The upper disc is dropped onto the lower disc and they stick together. What is the rotation rate AND direction of the two disc system? Disk 2 Disk 1 (a) (b)
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