2.41 The device shown consists of a disk that is rotated by a shaft. The disk is positioned very close to a solid boundary. Be- tween the disk and the boundary is viscous oil. a. If the disk is rotated at a rate of 1 rad/s, what will be the ratio of the shear stress in the oil at r= 2 cm to the shear stress at r = 3 cm? b. If the rate of rotation is 2 rad/s, what is the speed of the oil in contact with the disk at r = 3 cm? c. If the oil viscosity is 0.01 N s/m² and the spacing y is 2 mm, what is the shear stress for the conditions noted in part (b)? Oil 4 PROBLEMS 2.41, 2.42 Disk

2.41 The device shown consists of a disk that is rotated by a shaft. The disk is positioned very close to a solid boundary. Be- tween the disk and the boundary is viscous oil. a. If the disk is rotated at a rate of 1 rad/s, what will be the ratio of the shear stress in the oil at r= 2 cm to the shear stress at r = 3 cm? b. If the rate of rotation is 2 rad/s, what is the speed of the oil in contact with the disk at r = 3 cm? c. If the oil viscosity is 0.01 N s/m² and the spacing y is 2 mm, what is the shear stress for the conditions noted in part (b)? Oil 4 PROBLEMS 2.41, 2.42 Disk

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with. 

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2.41 The device shown consists of a disk that is rotated by a
shaft. The disk is positioned very close to a solid boundary. Be-
tween the disk and the boundary is viscous oil.
a. If the disk is rotated at a rate of 1 rad/s, what will be the ratio
of the shear stress in the oil at r = 2 cm to the shear stress at
r = 3 cm?
b. If the rate of rotation is 2 rad/s, what is the speed of the oil in
contact with the disk at r = 3 cm?
c. If the oil viscosity is 0.01 N s/m² and the spacing y is 2 mm,
what is the shear stress for the conditions noted in part (b)?
Oil
4
PROBLEMS 2.41, 2.42
Disk

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