(a) A small spherical rain drop (radius = 0.2 mm, weight = 3.3Ă—10-7 N)
experiences a drag force at speed v given by (6.8Ă—10-8 N.s/m) v. [No, that's not a
mistake: if the viscosity of the air rather than the turbulence dominates, then the drag
force is proportional to v, not v².] What is the terminal speed of the drop?