A star of spectral type G lives approximately how long on the main sequence?
A) 10 billion years
B) 1 billion years
C) 10 million years
D) 1,000 years
E) 10,000 years
A
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A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The ball is referred to at the two-second time. The distance below the rooftop is __________
Fill in the blank(s) with correct word
Process of Science: Most galaxies do not obey Hubble's Law perfectly. Why do we not take this as evidence that Hubble's law (and the theory of the expanding universe) is incorrect?
What will be an ideal response?
The internal resistances of an ideal voltmeter and an ideal ammeter are, respectively (ideal meaning the behavior of the system is not changed when using the meter):
a. zero and infinite. c. zero and zero. b. infinite and zero. d. infinite and infinite.
Coefficient of performance is
A) 1 - Qcold/Qhot. B) Q/m. C) Qout/Win. D) Q - W. E) 1 - Tcold/Thot.