Which of the following is not considered crucial for life to exist on some world?
A) a liquid, such as liquid water
B) a source of energy that can be used by life
C) a source of nutrients
D) an atmosphere
D) an atmosphere
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Why is spectral intensity not diminished by the distance from the source of radiation?
What will be an ideal response?
An explosion occurs 34 km away. The time it takes for its sound to reach your ears, traveling at 340 m/s, is
A) 0.1 s. B) 1 s. C) 10 s. D) 20 s. E) more than 20 s.
Looking forward, common consensus will likely agree that the wisest use of fossil fuels is to
A) convert them to heat and smoke. B) save them for tomorrow's materials. C) extract and sell them as quickly as possible. D) all of the above
A non-conducting sphere of radius R = 7 cm carries a charge Q = 4 mC distributed uniformly throughout its volume
At what distance, measured from the center of the sphere does the electric field reach a value equal to half its maximum value? A) 3.5 cm only B) 4.9 cm only C) 3.5 cm and 9.9 cm D) 3.5 cm and 4.9 cm E) 9.9 cm only