On a cold day, a heat pump absorbs heat from the outside air at 14°F (?10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum COP of the heat pump
a. 0.2
b. 4.4
c. 0.5
d. 7.6
e. 6.7
d
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When something is thrown over large distances (on Earth), what new factor comes into play?
a. The curvature of the Earth. b. The increase in gravity over long distances. c. The decrease in gravity over long distances. d. The tendency of thrown objects to fall to the ground. e. The difference between miles and kilometers.
Consider a situation where two moving objects collide and rebound from each other. Linear momentum
a. is definitely conserved b. is definitely not conserved c. may or may not be conserved, depending on the nature of the collision d. none of the above
The most accurate Greek attempt to explain planetary motion was the model of
A) Aristotle. B) Pythagoras. C) Hipparchus. D) Ptolemy. E) Erastothenes.
The beat frequency produced when a 240-hertz tuning fork and a 246-hertz tuning fork are sounded together is
A) 6 hertz. B) 12 hertz. C) 240 hertz. D) 245 hertz. E) none of the above