One kilowatt-hour represents
A) 1 N.
B) 60 N/s.
C) 60,000 W.
D) 3.6 million joules.
E) none of these
Answer: D
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The location in the Hertzsprung-Russell (H-R) diagram of giant stars fusing helium is referred to as the vertical branch
Indicate whether the statement is true or false
How are low-mass red giant stars important to our existence?
A) These stars manufactured most of the carbon atoms in our bodies. B) These stars manufactured virtually all the elements out of which we and our planet are made. C) These stars generate the energy that makes life on Earth possible. D) These stars provide most of the light that reaches us from globular clusters.
The clearest images of Uranus shown in the text have been obtained using:
A) the Hubble Space Telescope. B) infrared ground- based telescopes at the Keck Observatory. C) the Pioneer Spacecraft. D) the Cassini Spacecraft. E) visible light ground-based telescopes at the European Southern Observatory.
Power is
a. the time rate of doing work. b. the time rate of doing velocity. c. the time rate of doing momentum. d. the time rate of doing force.