A large fan placed in a closed room is effective by enhancing
A) conduction.
B) convection.
C) sublimation.
D) radiation.
B
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The Moon's density, when compared to Earth's, is about
A) 10% as large. B) 25% as large. C) 50% as large. D) 60% as large. E) the same.
Three cars (car F, car G, and car H) are moving with the same velocity, and slam on the brakes. The most massive car is car F, and the least massive is car H
Assuming all three cars have identical tires, which car travels the longest distance to skid to a stop? A) They all travel the same distance in stopping. B) Car F C) Car G D) Car H
What scientist discovered more elements than any other person?
a. Lavoisier b. Boyle c. Berzelius d. Davy
The background microwave radiation, discovered in 1965 by Penzias and Wilson, has its peak intensity at a wavelength of 1.06 mm
What blackbody temperature does this wavelength imply for the universe? (? = 5.670 × 10-8 W/m2 • K4, Wien displacement law constant is 2.90 × 10-3 m • K) A) 0.00°C B) 0.0027 K C) -2.7°C D) -270°C E) 2.7°C