Energy in Inductors: A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in its magnetic field?
A. 2.0 mJ
B. 10 mJ
C. 20 mJ
D. none of the given answers
Answer: D
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A polymer blend of 60 volume % SPB 88 and 40 volume % SPB 78 is heated to 130°C and then cooled.
(a) Upon slow cooling, at what temperature does the single phase start to separate into two phases?
(b) How many phases are present at 70°C?
(c) What is the composition of each phase at 70°C?
(d) What is the volume fraction of each phase present at 70°C?
What is a void?
A. a part of the sky that astronomers cannot observe due to bright emission from interstellar dust B. another name for a dark nebula C. a part of the sky where no galaxies are visible to us because of obscuring dust in the milky way D. a region in the universe where there are almost no galaxies
Once a basketball player's feet are off the floor in making a jump, the jumper's acceleration
A) depends on launch speed. B) is usually greater for taller players. C) varies with body orientation. D) is g; no more, no less. E) all of the above
A reversible engine operating between 500 K and 300 K has the same efficiency as a reversible engine operating between 400 K and what lower temperature?
A) 200 K B) 220 K C) 240 K D) 260 K E) 280 K