College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A cup and bob geometry is filled with a fluid, and the bob rotates at a rate of ω = 1
Hz (Hz, or hertz, has a unit of # rotations per second). The bob has a radius of R = 1 cm.
(a)What is the velocity of the bob at point P on the surface of the bob in m/s?
(b)What is the velocity of the fluid touching point P on the bob in m/s?
(c) Why can we be confident of our answer to part (b)?
(d) What type of stress (shear, normal, or both) does the bob have to exert on the fluid
to rotate?
Transcribed Image Text:R
bob
cup
Section AA
Point P
Fluid (blue)
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