What is the main potential concern regarding the creation of artificial life?
A) that they would rapidly evolve and replace existing life on Earth
B) that they would be used by hostile nations to build clone armies
C) that they might be the source of new diseases or toxins for which terrestrial life would have little resistance
D) that they would travel on our robotic space probes and contaminate other planets
C
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The footprints left on the moon by the Apollo astronauts will likely last for
A) millions of years. B) no time; they were quickly erased by micrometeorites. C) the remaining existence of the Moon. D) a few decades.
A slab of concrete and an insulating board are in thermal contact with each other. The temperatures of their outer surfaces are 68°F and 50°F. Determine the rate of heat transfer (in BTU/ft2/h) if the R values are 1.93 and 8.7 ft2/°F/h/BTU, respectively
a. 9.7 b. 2.5 c. 5.3 d. 1.7 e. 28
What is the symbol for the element whose atoms have 92 protons each?
a. Nb b. U c. Zn d. None of these
Two inflated balloons are of identical size and shape, but one is filled with hydrogen, the other helium. Which has the larger buoyant force on it?
a. neither—the buoyant forces must be equal b. the helium balloon c. the hydrogen balloon d. It can't be determined.