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 2Humans
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
Question 3In electricity, what quantity is analogous to the acceleration of gravity g (which is a force per unit mass)?
A) electric force
B) electric field
C) electric potential
D) electric charge
E) an electric dipole
Question 4A bicycle wheel has an outside diameter of 66 cm. How far does a point on the rim travel when the wheel rotates through an angle of 70?
What will be an ideal response?
Question 5An arrow of mass 20. g is shot horizontally into a bale of hay, striking the hay with a constant velocity of 60. m/s. It penetrates a depth of 20. cm before stopping. What is the average stopping force acting on the arrow?
What will be an ideal response?
Question 6Chemical analysis of a rock can tell us
A) when the rock formed
B) the detailed geological history of the rock
C) what the rock is made of
D) the temperature and pressure conditions under which it formed
Question 7A submarine must travel how fast (with respect to the water) and be pointed in what direction such that it moves 10. m/s directly Northward (relative to the Earth) if the water moves westward at 5.0 m/s?
What will be an ideal response?
Quick Reply
