Which of the following sources of electric power is NOT an example of a heat engine?
A. Fossil fuels
B. Geothermal
C. Wind energy
D. Flat plate solar collectors
C. Wind energy
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The Sun's average surface (photosphere) temperature is about
A) 5,800 K. B) 1,000,000 K. C) 1,000 K. D) 37,000 K.
What are the dark blobs (indicated by the red arrows) in this photograph from the Hubble Space Telescope?
A) cold, dense molecular clouds in which stars are forming B) warm atomic hydrogen gas, much like most of the gas in the galaxy C) tall interstellar bubbles blown out by supernovae or stellar winds D) jets of hot gas shot out from young binary star systems
Olbers's paradox is based on the assumption that the Universe began at some time in the past
Indicate whether the statement is true or false
A 2.0-?F capacitor is charged to 12 V and then discharged through a 4.0 × 106 ? resistor. How long will it take for the voltage across the capacitor to drop to 3.0 V?
A) 4.5 s B) 8.0 s C) 11 s D) 22 s E) 24 s