Contrast Aristotle's predictions concerning free-falling bodies with Galileo's predictions
What will be an ideal response?
Aristotle said heavier bodies fall faster than light bodies; so if the two were dropped at the same time, the heavier body would strike the ground sooner. Galileo observed that the motion was independent of the body's mass provided air friction was not significant.
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Carnot Engine: An ideal Carnot heat engine operates between reservoirs at 1740 K and 150 K. In each cycle, 260 J of heat energy is rejected to the low temperature reservoir. In each cycle, how much mechanical work W is performed by the engine?
Fill in the blank(s) with the appropriate word(s).
Which of the following is the main reason for the fact that hydroelectric power plants are far more efficient than coal-fired electric power plants?
A) Hydroelectric plants have far fewer moving parts. B) Coal is only partially combustible, due to the presence of large amounts of impurities. C) The law of conservation of energy tells us that heat engines, such as hydroelectric plants, are more efficient than other forms of energy conversion. D) Since the hydroelectric plant is not a heat engine, it is not restricted by the second law of thermodynamics. E) Actually, hydroelectric plants are not significantly more efficient than coal-fired plants.
By what amount does the sound intensity decrease when the distance to the source doubles?
a. 1.4 dB b. 2 dB c. 4 dB d. 6.0 dB e. 0.25 dB
In the equation A = B/C, the A and B are said to be _______________ proportional
a. directly b. inversely c. not d. exactly