Which of the following is not a feature of a good index fossil?
a. Numerous specimens found
b. Occurrence limited to a few localities
c. Easily identified species
d. Limited time span of existence
b
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Where are open clusters found?
A.) No stars are forming in the galaxy today. B.) In the halo C.) In the disk. D.) Only around the Sun. E.) B and C.
Which one of the following equations is correct for the maximum kinetic energy of photoelectrons ejected from a metal?
A) Kmax = hc - Wo B) Kmax = h? - Wo C) Kmax = hf - Wo D) Kmax = h?/c - Wo E) None of the other choices is correct.
At what rate is thermal energy generated in the 30-? resistor?
a.
20 W
b.
27 W
c.
60 W
d.
13 W
e.
30 W
Two cylinders made of the same material roll down a plane inclined at an angle ? with the horizontal. Each travels the same distance. The radius of cylinder B is twice the radius of cylinder A. In what order do they reach the bottom?
A. A reaches the bottom first because it has the greater acceleration. B. A reaches the bottom first because it has a smaller rotatinal inertia. C. B reaches the bottom first because is experiences a larger torque. D. B reaches the bottom first because it travels a larger distance in one rotation. E. They both reach the bottom at the same time, because each has the same linear acceleration.