Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is
A) twice as much as the 25-kg sack.
B) half as much as the 25-kg sack.
C) the same.
D) need more information
Answer: C
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Thermodynamic Processes: When a gas expands adiabatically,
A. the internal (thermal) energy of the gas decreases. B. the internal (thermal) energy of the gas increases. C. it does no work. D. work is done on the gas. E. the temperature of the gas remains constant.
What gas is the primary constituent of our atmosphere?
A) oxygen B) carbon dioxide C) nitrogen D) hydrogen E) helium
Life jackets help you float because
A) the jacket causes you to weigh less. B) the jacket has the same density as an average human. C) the jacket repels water. D) if you sink, the jacket sinks. E) the combined density of you and the jacket is less than your density alone.
Wave frequency could be given in
a. 1/s. b. s-1 c. Hz. d. any of these.