The torque on the rotating loop of wire in a DC motor ________ as the loop rotates
A) is inversely proportional to the current
B) is constant in magnitude
C) varies in magnitude
D) is zero
C
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If 2.0 g of water at 0.00°C is to be vaporized, how much heat must be added to it? The specific heat of water is 1.0 cal/g ? K, its heat of fusion is 80 cal/g, and its heat of vaporization is 539 cal/g
A) 1100 cal B) 1100 kcal C) 1200 cal D) 1300 cal E) 1500 cal
A __________ has half-integral spin
Fill in the blank(s) with correct word
Why was it important to have a "boring" patch of sky for the Hubble Deep Field?
A. To minimize the number of objects in the view that were local to our own galaxy. B. To first take a "flat field" for use in comparison to a more interesting part of the sky. C. To avoid catching a comet or asteroid that could end up a blur streak across the entire image. D. To prevent the Hubble Space Telescope overheating from bright light sources. E. Honoring the memory of Edwin Hubble, who first searched this same part of space.
The nuclear epoch occurred during the formation of:
A) only protons and neutrons. B) dark energy. C) deuterium and helium. D) all elements up to iron. E) all known elements.