A 15-?F capacitor and a 25-?F capacitor are connected in parallel, and charged to a potential difference of 60 V. How much energy is then stored in this capacitor combination?
a. 50 mJ
b. 18 mJ
c. 32 mJ
d. 72 mJ
e. 45 mJ
d
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The luminosity class is assigned to a star by studying the absorption lines in the spectrum of the star
a. True b. False Indicate whether the statement is true or false
The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a hundred years ago. B) a thousand years ago. C) tens of thousands of years ago. D) hundreds of thousands of years ago. E) a million years ago.
(Choose all that apply.) An observatory in space could in principle detect
A) visible light. B) x-rays. C) infrared light. D) ultraviolet light. E) radio waves. F) gamma rays.
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