Another name applied to the grain size in a rock is
a. specific gravity.
b. porosity.
c. texture.
d. streak.
c
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How do astronomers know that the nuclei of some galaxies are active?
a. Their nuclei are much brighter than expected. b. The orbits of stars near the center of the galactic nuclei are faster than expected. c. The luminosity of the nuclei varies over time. d. The color of the nuclei is different than expected.
If you release a single molecule in an evacuated region it will initially
A) fall just as a baseball would. B) move in any direction. C) convect upward. D) be buoyed upward. E) none of the above
On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 25 kW
What is the rate of increase of the entropy of the universe as a result of this? A) 13 W/K B) 25 W/K C) 85 W/K D) 99 W/K E) 0 W/K
A 120-V rms voltage at 60 Hz is applied across a 20-?F capacitor and an unknown resistor. If the rms value of the current in that circuit is 0.60 A, what is the value of the resistor?
A) 60 ? B) 120 ? C) 180 ? D) 150 ? E) 200 ?