A certain ac signal at 60 Hz is applied across a 40-mH inductor and a 200-? resistor. What is the power factor of this circuit?
A) 0.249
B) 0.497
C) 0.697
D) 0.997
E) None of the other answers is correct.
D
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Gravitational lensing
a. occurs when light passes near a massive object and is deflected by the object's gravitational field. b. can be used to determine the luminosity of a galaxy. c. occurs when the mass of a galaxy is greater than expected from the luminosity of the galaxy. d. occurs when the mass of a galaxy is less than expected from the luminosity of the galaxy. e. can be used to determine the recessional velocity of a galaxy.
Estimate the surface area of an adult human’s head.
A. 0.05 
B. 0.1
C. 0.05
D. 0.01
what is the Saros cycle
a) the period between total solar eclipses b)the period between a total solar eclipse and a total lunar eclipse c) the 18-year cycle over which the pattern of eclipses repeats
The diagram below illustrates the layout and light path of a reflecting telescope of the ____________________ design
Fill in the blank(s) with correct word