A certain 20-A circuit breaker trips when the current in it equals 20 A. What is the maximum number of 100-W light bulbs you can connect in parallel in an ideal 120-V dc circuit without tripping this circuit breaker?
A) 27 B) 11 C) 17 D) 23
D
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Diagram 3-1 shows three approximate locations of the setting Sun along the western horizon. Which number indicates the location of the Sun at sunset on December 21 (winter Sun) for an observer at a latitude of 48° north of the equator? Choose the best answer
a. 1
b. 2
c. 3
d. The Sun will set in the east for an observer in the southern hemisphere.
e. The Sun will not set on December 21 at this latitude.
Rovers sent to Mars have discovered
A) minerals in Martian rocks that can only form in liquid water. B) clear evidence that life once existed on Mars. C) Mars has more craters than previously thought. D) small pockets of liquid water lying just beneath the Martian soil.
Which of the following is closest in mass to a white dwarf?
A) the Moon B) Earth C) Jupiter D) the Sun
Which of the following is a period of the Cenozoic era?
a. Eocene b. Quaternary c. Cretaceous d. Cambrian