Which of the following might best describe the product obtained from soap and hard water (i.e., soap scum)?
A) a
B) b
C) c
D) d
E) none of the above
Answer: C
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What is this a picture of?
A) a cluster of galaxies B) a globular cluster C) an elliptical galaxy D) the expanding universe
Pluto's bulk density is:
A) 3,400 kg/m3, comparable to our Moon's. B) 2,100 kg/m3, similar to Callisto's mix of rock and ice. C) 1,200 kg/m3, like Mimas, made of almost pure ice. D) 700 kg/m3, like Saturn a mix of hydrogen and helium slush. E) 400 kg/m3, like Comet Halley's nucleus, a ice ball with many gas pockets.
An extraterrestrial observer would pick up the strongest radio signals when
A) the Earth was at perihelion. B) at new or full moon. C) North America was directly in front of the observers. D) North America was either rising or setting for the observer. E) the Super Bowl is on.
Infiltration in a house will ________
a. increase on windy days b. raise the heating load by about 10% c. reduce the number of air changes d. be increased by caulking around windows