(a) Why does the flexible body such as the string of a yarn placed in a viscous fluid shown in the movie does not reverse its shape when the motion of the outer boundary is reversed? (b) A slender rod (i.e. a rod with d/L < <1) is settling in a viscous fluid due to its weight. What is the angle made by its sedimentation velocity with the vertical if the axis of the rod is inclined at an angle of 30 with the vertical? (c) Why does the rod not rotate (say, in the question (b) above)? (d) Will the rod with twice the diameter fall four times faster? Why or why not