Vol 6 - Landau+Lifschitz - Fluid Mechanics · Problem 24.3

TURBULENCE

Physics — Landau & Lifshitz · oscillatory-motion-viscous-fluid

Problem

A plane disk with large radius

R

executes rotary oscillations with small amplitude about its axis, the angle of rotation being

\theta = \theta_0 \cos \omega t

, where

\theta_0 \ll 1

. Determine the moment of the frictional forces acting on the disk.