Most of the hydrogen we use in the United States comes from
A. pockets of hydrogen gas found underground
B. hydrogen gas extracted from the atmosphere
C. hydrogen produced in nuclear reactors
D. It is manufactured from fossil fuels and/or water.
Answer: D. It is manufactured from fossil fuels and/or water.
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A gas expands from an initial volume of 30.0 L to a final volume of 65.0 L at a constant pressure of 110 kPa. How much work is done by the gas during this expansion?
A) 3.85 MJ B) 3.85 kJ C) 10.4 kJ D) 3850 kJ E) 10.4 MJ
Iridium is an element that is relatively
A) abundant on Earth, but very rare in meteorites. B) rare on Earth, but very common in meteorites. C) abundant on both the Earth and the Moon. D) rare on both Earth and in meteorites.
If two light waves are coherent, which of the following is NOT necessary?
A) They must have the same frequency. B) They must have the same wavelength. C) They must have the same amplitude. D) They must have the same velocity. E) They must have a constant phase difference at every point in space.
If an apple falls a distance of 2 meters in its first second of fall, then 2 meters in its next second of fall, and again 2 meters during its third second of fall, the acceleration of the apple is
1) 0 m/s2. 2) 2 m/s2. 3) 4 m/s2. 4) 10 m/s2. 5) actually, more than 10 m/s2. This is because 6) no change in velocity occurs during fall. 7) the apple increases in distance by 2 meters for each successive second. 8) the average velocity is 1 m/s for each successive second. 9) its weight is counterbalanced by its inertia.