A 4000-? resistor is connected across a 220-V power source. What is the current through the resistor?
A) 0.055 A
B) 1.8 A
C) 5.5 A
D) 18 A
A
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A major advantage of a Newtonian reflector over a refractor is:
A) its compact size. B) the elimination of chromatic aberration. C) there are only two lenses to grind. D) the central hole in the mirror is smaller. E) the elimination of the secondary mirror.
Aristotle believed that natural laws could be understood by _______. In contrast to Aristotle's way of explaining nature, Galileo relied on __________.
A. logic; experiment B. experiment; logic C. mathematics; patterns D. patterns; mathematics
A force of 30N stretches a very light ideal spring 0.73m from equilibrium. What is the force constant (spring constant) of the spring?
A) 34 N/m B) 41 N/m C) 46 N/m D) 22 N/m
Nuclear fusion in the Sun is tremendously powerful
a. True b. False Indicate whether the statement is true or false