Author Question: When a small spherical rock of radius r falls through water, it experiences a drag force (a)(r)(v), ... (Read 50 times)

renzo156 · **on:** Jul 27, 2018

When a small spherical rock of radius r falls through water, it experiences a drag force (a)(r)(v), where v is its velocity and a is a constant proportional to the viscosity of water.

From this, one can deduce that if a rock of diameter 2 mm falls with terminal velocity, v, then a rock of diameter 4 mm will fall with terminal velocity A) v / 4.
B) 2 v.
C) v / 2.
D) 4 v.
E) v.

Question 2

Humans

A) and primates evolved from a common ancestor
B) and primates evolved directly from dinosaurs
C) and primates evolved directly from birds
D) evolved directly from modern primates