The pair of water-filled caissons of the Falkirk Wheel have equal weights whenever
A) they carry equal-weight floating boats.
B) one carries a heavy floating boat and the other only water.
C) they carry unequal weights of floating boats.
D) all of the above
E) none of the above
Answer: D
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Answer the following statement true (T) or false (F)
Results from the Phoenix lander and Curiosity rover suggest that the positive result from the Viking Labeled Release experiment was probably due to
A) the destruction of organic molecules by oxygen released when perchlorates in the soil decomposed on heating B) terrestrial contamination from the robotic arm which took the samples C) a malfunction in the experiment D) high levels of radioactivity in the soil
Temperature in the air can decrease by the process of
A) moisture condensation. B) moisture evaporation. C) contact with warm surfaces. D) solar radiation.
What radionuclide has a well-known percentage
content in all living organisms until the time that they die, and so can be used to determine how long fossil samples have been dead? a) carbon-14 b) carbon-12 c) uranium-238 d) uranium-235