A small steel sphere falls with terminal velocity of 2.00 cm/s in a viscous fluid. If the radius of the steel sphere is doubled, what will the new terminal velocity of the sphere be?
A) 1.00 cm/s
B) 2.00 cm/s
C) 4.00 cm/s
D) 6.00 cm/s
E) 8.00 cm/s

Question

Quizplus · Accepted Answer

The terminal velocity of a sphere in a viscous fluid is proportional to the square of its radius. Doubling the radius increases the terminal velocity by a factor of four, so the new terminal velocity is 8.00 cm/s.

A Small Steel Sphere Falls with Terminal Velocity of 2