What is the period for a frequency of 60 Hz?
A. 60 s
B. (1/60) s
C. 120 s
D. (1/120) s
E. (1/377) s
B. (1/60) s
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How many seconds are in one year? (Calculate this, do not look it up.)
A) about 380 million (380,000,000, or 3.8 × 108) B) about 30 million (30,000,000, or 3 × 107) C) about 86 thousand (86,000, or 8.6 × 105) D) about 3600 (3.6 × 103)
The circuit below contains three 100-W light bulbs and a capacitor. The emf ? = 110V. At the instant the switch S is closed, which light bulb is brightest?
A. A B. B C. C D. A and B E. All three are equally bright.
In what two ways is Titan's atmosphere like our own? Now name two differences
What will be an ideal response?
Helium, He, is a nonmetallic gas and the second element in the periodic table. Rather than being placed adjacent to hydrogen, H, however, helium is placed on the far right of the table because
A) hydrogen and helium repel one another. B) the sizes of their atoms are vastly different. C) they come from different sources. D) helium is most similar to other group 18 elements.