A catenary in nature is evident in
A) eggs.
B) a necklace drooping between your fingers.
C) the domes of some modern buildings.
D) all of the above
Answer: D
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A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is
A) one-fourth as much. B) one-half as much. C) twice as much. D) four times as much. E) the same.
Why is 2,4,5-trifluorophenol much more acidic than phenol?
A) The fluorines adjacent to the OH group are large and shield the hydroxl group from making the solution basic. B) The fluorines de-stabilize the benzene ring and thus give the structure more acidic characteristics. C) The fluorines have high electronegativities and help to stabilize the negative charges, which makes it even easier for the hydrogen to be lost. D) False! 2,4,5-trifluorophenol is actually not more acidic than phenol.
This ancient navigational instrument is called a(n)
A) astrolabe. B) celestial sphere. C) cross-staff. D) analemma.
The materials that compose most of Titan are completely different than those that compose Earth. Therefore, what were scientist surprised to see from space-probe images in a 2005 landing?
A) some indications that an ancient civilization may have inhabited Titan approximately 500,000 years ago B) a landscape similar to Earth's C) an utterly alien landscape, unlike anything seen on Earth D) the image of a man's face on an equatorial mountain range