The graphs below represent current and voltage phasors at one instant of time. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax.Which graph shows the correct relationship between current and voltage phasors for an inductor in an RL circuit?
A.
B.
C.
D.
E.
Answer: A
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A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle. What is the coefficient of performance?
A. 4 J B. 20 J C. 24 J D. 44 J
A Carnot engine is operated as a refrigerator, taking in 18. J of heat every second and expelling 20. J into a 23.°C room. What is the temperature inside the refrigerator?
A) 300. K B) 15°C C) -15°C D) -6.6°C E) 3.0°C
The motion of gas in accretion disks and jets is ____. a. well explained by Einstein's theory of general relativity b. poorly understood, but may depend on magnetism c. well explained by Kepler's laws
d. poorly understood, but may depend on relativity e. well explained by electromagnetic wave theory
Briefly explain the meaning of each term in the equation Number of Civilizations = Np × flife × fcivilization × fnow
What will be an ideal response?