How far above the horizon is the Moon when its image reflected in calm water is completely polarized?
A) 36.9°
B) 43.2°
C) 46.8°
D) 53.1°
E) 57.5°
A
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Total Internal Reflection: A point source of light is positioned 20.0 m below the surface of a lake. What is the diameter of the largest circle on the surface of the water through which light can emerge into the air? The index of refraction of water is 1.33.
Fill in the blank(s) with the appropriate word(s).
Rotation curves for spiral galaxies show:
A) they are slowing down. B) rotation speed drops off further from the nucleus. C) most have dark halos. D) most of the mass lies in the nucleus. E) no relation to mass.
The bathyscaphe Trieste consists of a thin-walled but very strong cylindrical hull, 15.2 m long and 3.66 m in diameter,
filled with gasoline with a density of 880 kg/m3 to make it buoyant. If it is totally submerged in seawater with a density of 1025 kg/m3 and neither rising nor sinking, what is the weight of the Trieste craft? A) 127 kN B) 227 kN C) 327 kN D) 427 kN E) 527 kN
A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 10^5 J/kg)