When a small spherical rock of radius r falls through water, it ...

[renzo156]

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

[huda]

Answer to Question 1

D

Answer to Question 2

A

[renzo156]

Excellent

[kilada]

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