Consider an LRC circuit. The impedance of the circuit increases if R increases. When is this statement true?
A)
always true
B)
true only if XL is less than or equal to XC
C)
true only if XL is greater than or equal to XC
D)
true only if XL is equal to XC
E)
never true
A
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A. Crater |
B. Stone meteorites |
C. Tektites |
D. Meteors |
E. Regmaglypts |
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Venus' full phase occurs when Venus is at:
A) opposition. B) the deferent. C) conjunction. D) inferior conjunction. E) superior conjunction.
How much energy is stored in the 50-?F capacitor when Va ? Vb = 22V?
a.
0.78 mJ
b.
0.58 mJ
c.
0.68 mJ
d.
0.48 mJ
e.
0.22 mJ
The presence of gases such as carbon dioxide and water vapor in a planet's atmosphere is direct evidence of _________ in a planet's history.
a. high surface temperatures b. volcanic activity c. cometary impacts d. a lack of asteroid impacts e. the greenhouse effect