2.41 The device shown consists of a disk that is rotated by ashaft. 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 ra-tio of the shear stress in the oil at r =2 cm to the shear stress atr =3 cm?b. If the rate of rotation is 2 rad/s, what is the speed of the oilin contact with the disk atr = 3 cm?c. Ifthe 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)?2PipeOil filmCylinderPROBLEM 2.40

According to given data The disk is positioned very close to a solid boundary. Between the disk and…

The disk is positioned very close to a solid bou he disk and the boundary is viscous oil. e disk is rotated at a rate of 1 rad/s, what will e shear stress in the oil at r = 2 cm to the she cm? e rate of rotation is 2 rad/s, what is the speec act with the disk at r = 3 cm? %3D

The disk is positioned very close to a solid bou he disk and the boundary is viscous oil. e disk is rotated at a rate of 1 rad/s, what will e shear stress in the oil at r = 2 cm to the she cm? e rate of rotation is 2 rad/s, what is the speec act with the disk at r = 3 cm? %3D

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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A: Solution_1

Concept explainers

Instruments for Surveying

Surveying is the practice that determines the relative three-dimensional positions of many different points on the earth’s surface. There are various instruments used in Surveying like Theodolites, Total station, Tripod stands, Plane table, etc. for measuring horizontal angle, vertical and sloping angle, which are very useful for giving accurate and precise measurement.

Question

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 ra-
tio 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 atr = 3 cm?
c. Ifthe 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)?
2
Pipe
Oil film
Cylinder
PROBLEM 2.40

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