The shell model is an example of a
A) physical model.
B) conceptual model.
C) both a physical and conceptual model.
D) None of the above.
Answer: B
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An ant and an elephant are walking through the jungle. On which does the greater buoyant force act?
A. The elephant B. The ant C. The same buoyant force acts on both D. Neither is floating, so no buoyant force is acting at all
On a calm day (no wind), you can run a 1500-m race at a velocity of 4.0 m/s. If you ran the same race on a day when you had a constant tailwind of 2.0 m/s, the time it would take you to finish would be
A) 250 s. B) 9000 s. C) 1125 s. D) 750 s. E) 500. s.
If a gas cloud shrinks, its gravitational potential energy is converted into
A) chemical energy. B) thermal energy and radiative energy. C) kinetic energy and sound waves. D) only radiative energy.
Atoms are mostly empty space
a. True b. False Indicate whether the statement is true or false