If R1 = 3.0 ?, R2 = 6.0 ?, R3 = 12 ?, and I = 0.50 A, at what rate is heat being generated in R1?
A. 20 W
B. 17 W
C. 12 W
D. 31 W
E. 6.0 W
Answer: C
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The north celestial pole appears 30° above your horizon. The star Vega is on your meridian. By studying your star charts and your clocks, you determine that Vega crossed the meridian in Greenwich (England) 3 hours ago. Where are you?
A) latitude 30°N, longitude 45° west B) latitude 30°N, longitude 3° west C) latitude 60°N, longitude 45° west D) It is not possible to determine your longitude from the information given.
Comparing the clouds of Earth and Venus, we find that:
A) both are made chiefly of water vapor. B) ours lie in the troposphere, within 10 kilometer of our surface, but Venus has a higher troposphere, with its clouds about 40 kilometers high. C) like ours, they rotate around Venus slower than Venus rotates on its axis. D) Venus has much more carbon dioxide, so dry ice clouds dominate. E) Venus is too hot for clouds to form, so we see only a barren world telescopically.
Neutral hydrogen can be detected because its electron occasionally ________ its spin and creates the 21-cm emission line for radio observers
Fill in the blank(s) with correct word
The annual amount of snow lost by a glacier is called
A) accumulation. B) sublimation. C) ablation. D) sustation.