As global warming progresses, the
A) landmasses will warm the most
B) equatorial regions will warm the most
C) polar regions will warm the most
D) oceans will warm the most
C
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Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do
A) Both men do positive work, but Joel does 75% more work than Jerry. B) Both men do positive work, but Joel does 50% more work than Jerry. C) Both men do positive work, but Jerry does 50% more work than Joel. D) Both men do positive work, but Joel does 25% more work than Jerry. E) Neither of them does any work.
What happens when a star like the sun exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It contracts, becoming hotter and brighter. C) It contracts, becoming smaller and dimmer. D) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness. E) It expands, becoming bigger but dimmer.
A 6.0-m wire with a mass of 50 g, is under tension. A transverse wave, for which the frequency is 810 Hz, the wavelength is 0.40 m, and the amplitude is 4.0 mm, is propagating on the wire
The time for a crest of this wave to travel the length of the wire is closest to A) 19 ms. B) 16 ms. C) 21 ms. D) 23 ms. E) 25 ms.
The source of electromagnetic waves is vibrating
A) electric charges. B) atoms. C) molecules. D) energy fields.