The difference between a DC and an AC generator is that
a.
the DC generator has one unbroken slip ring.
b.
the AC generator has one unbroken slip ring.
c.
the DC generator has one slip ring split in two halves.
d.
the AC generator has one slip ring split in two halves.
e.
the DC generator has two unbroken slip rings.
c
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The interior of Earth is studied by using
a. infrared light waves. b. yellow light waves. c. seismic waves. d. gamma waves.
Which type of heavy atomic nuclei are most common, and why?
A) Transuranium elements, for only very heavy elements are made in supernovae. B) Odd numbered elements, because hydrogen is the building block for all heavier elements. C) Even numbered elements, for helium is "giant food" for everything beyond itself. D) Metals, for iron is the last abundant element formed before the type II supernova. E) Noble gases, for they are the most stable elements.
When water freezes, the entropy of the water
A) increases. B) decreases. C) does not change. D) could either increase or decrease; it depends on other factors.
A cohesive aggregate of one or more minerals is called a
a. crystal. b. gem. c. silicate. d. rock.