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.
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.
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