5.18 Consider an anelastic material cycled at frequency \omega.
Show that there is a phase delay between stress and strain, amounting to 1/(Q \omega) seconds. [You may assume Q >> 1, and the discussion behind equ. 5.82 and Box 5.5.]
Does the stress lead the strain, or the strain lead the stress?
On a plot of strain against stress, there will be a hysteresis loop. Evaluate its area, and show that this is consistent with the first definition of Q given in Box 5.7.