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
Answer: D
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Free Fall: A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s?
A. 2.1 m/s B. 4.9 m/s C. -2.1 m/s D. -4.9 m/s E. 0.00 m/s
Which is NOT true?
A. A star that appears brighter than another is always closer. B. A blue Main Sequence star has a higher luminosity than a red main sequence star C. More massive Main Sequence stars are always both hotter and brighter than less massive Main Sequence stars D. A B-type Main Sequence star that appears 100 times brighter than another B type Main Sequence star is 10 times closer E. The spectrum of a star allows us to estimate its temperature
A ferromagnetic material loses this property above the ______________ temperature
Fill in the blank(s) with correct word
The "inverted population" necessary for laser action
A) refers to the negative energy levels of electrons. B) comes from upside-down levels in certain atoms. C) refers to the higher energy state being populated more than one below it. D) is another way of saying "coherent." E) is another way of saying "incoherent."