A Sphere of Radius 1 Cm Is Moving Through a Vat

Multiple Choice

A sphere of radius 1 cm is moving through a vat of corn syrup, which has a viscosity of 1.4 Pa s. A force of 0.01 N is needed to keep it moving at a constant speed. What is the speed? You may assume that Stokes' law applies.

A) 3.8 cm s-1.
B) 26 cm s-1.
C) 23 cm s-1.
D) 12 cm s-1.
E) 6.8 cm s-1.ANS