Conservation of charge means that
a. The total amount of charge in the universe is constant.
b. No experimenter has ever seen a single charge destroyed by itself.
c. Electrons by themselves can be neither created nor destroyed.
d. Charge can be neither created nor destroyed.
e. All of the above.
Ans: e. All of the above.
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Which of the following is evidence that solar activity affects Earth's climate?
A. The dust bowl of the 1930s in the United States coincided with the complete disappearance of sunspots during that time. B. The Maunder Minimum-a period of abnormally low sunspot numbers-coincided with abnormally cold northern winters. C. The Schwab Cycle-a period of abnormally numerous and large sunspots-preceded a 250-year drought in Africa. D. All of these choices are correct.
How does a caldera form?
What will be an ideal response?
Saturn's moon named ______________ is the second largest moon in the solar system
a. Titan b. Europa c. Ganymede d. Phobos e. Diamos
Which of these is not accelerating?
A) a car starting up from rest B) a car while it is moving at unchanging speed up a straight [or steady] incline C) a car going over the crest of a rounded hill at a constant speed D) a car while it is rounding a corner at constant [or steady] speed E) actually all of these cars are accelerating