Why does the burning of fossil fuels increase the greenhouse effect on Earth?
A) The heat from the flames warms the planet.
B) Burning fossil fuels releases carbon dioxide into the atmosphere.
C) Burning fossil fuels depletes the amount of ozone, thereby warming the planet.
D) Burning fossil fuels produces infrared light, which is then trapped by existing greenhouse gases.
B) Burning fossil fuels releases carbon dioxide into the atmosphere.
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The Atacama Large Millimeter Array achieves exceptional resolution by using exceptionally:
A) large radio antennas in a fixed array. B) large radio antennas in a mobile array. C) many radio antennas in a fixed array. D) many radio antennas in a mobile array. E) many portions of the electromagnetic spectrum.
Most of the deuterium that formed right after the Big Bang:
A) is still around today. B) broke down into electrons and neutrons. C) turned into dark matter. D) quickly burned into helium nuclei. E) was found in the globular clusters.
What beat frequency is produced by 240-Hz and a 246-Hz tuning forks?
A) 6 Hz B) 12 Hz C) 240 Hz D) 245 Hz E) none of the above
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5 sin (?t + ?/3). The phase (in rad) of the motion at t = 2 s is
a. 7?/3 b. ?/3 c. ? d. 5?/3 e. 2?