Which has the greater density?
A) a cup-full of fresh water
B) a lake-full of fresh water
C) both the same
D) need more information
Answer: C
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According to the theory that active galactic nuclei are powered by supermassive black holes, the high luminosity of an active galactic nucleus primarily consists of
A) light emitted by hot gas in an accretion disk that swirls around the black hole. B) intense radiation emitted by the black hole itself. C) the combined light of thousands of young, high-mass stars that orbit the black hole. D) radio waves emitted from radio lobes found on either side of the galaxy we see in visible light.
If a fossil bone is found to contain 1/16th as much Carbon-14 as the bone of a living animal, what is the approximate age of the fossil? (half-life of 14C = 5730 years)
a. 7640 years c. 45,800 years b. 22,900 years d. 17,200 years
An 800-MW electric power plant has an efficiency of 30%. It loses its waste heat in large cooling towers. Approximately how much waste heat (in MJ) is discharged to the atmosphere per second?
a. 1 200 b. 1 900 c. 800 d. 560 e. 240
Determine the magnitude and sense (direction) of the current in the 500-? resistor when I = 30 mA
a.
56 mA left to right
b.
56 mA right to left
c.
48 mA left to right
d.
48 mA right to left
e.
26 mA left to right