The most noteworthy highlight of the Mesozoic era was the
A) break-up of Pangaea.
B) emergence of humans.
C) Pleistocene extinction.
D) ice age.
Answer: A
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The pupil of the eye increases in size under which condition?
a. object viewed is well illuminated b. eye is focused on a nearby object c. object viewed is dimly illuminated d. eye is focused on a distant object
A 4.0-kg block slides down a 35° incline at a constant speed when a 16-N force is applied acting up and parallel to the incline. What is the coefficient of kinetic friction between the block and the surface of the incline?
A. 0.20 B. 0.23 C. 0.26 D. 0.33 E. 0.41
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The pressure on A2 is 40 psi. a. True b. False