A pivot bearing used on the shaft of an electrical instrument is shown in the figure below. An oil with a viscosity of μ = 0.010 lb-s/ft² fills the 0.0013-in. gap between the rotating shaft and the stationary base. Determine the frictional torque on the shaft when it rotates at 6700 rpm. 0.0013ín. 6700rpm 30⁰ 0.2 in. -0.010 lb-s/ft²

A pivot bearing used on the shaft of an electrical instrument is shown in the figure below. An oil with a viscosity of μ = 0.010 lb-s/ft² fills the 0.0013-in. gap between the rotating shaft and the stationary base. Determine the frictional torque on the shaft when it rotates at 6700 rpm. 0.0013ín. 6700rpm 30⁰ 0.2 in. -0.010 lb-s/ft²

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics.

Equilibrium of Forces

The tension created on one body during push or pull is known as force.

Question

A pivot bearing used on the shaft of an electrical instrument is shown in the figure below. An oil with a viscosity of μ = 0.010 lb-s/ft²
fills the 0.0013-in. gap between the rotating shaft and the stationary base. Determine the frictional torque on the shaft when it rotates
at 6700 rpm.
0.0013in.
6700rpm
30°
0.2 in.
-0.010 lbs/ft²

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Step 1: angular speed of shaft

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Step 2: calculate the viscous shear stress (τ)

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Step 3: calculating surface area in contact(A)

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Step 4: calculate the frictional torque (T)

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