Which of the following contributes to the problem of greenhouse-effect heating of the atmosphere?
A) Coal-burning power plants
B) Gasoline-fueled automobile engines
C) Both of the above.
D) Nuclear power plants
E) All of the above.
C
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The distance to a hypothetical galaxy is estimated at about 7 × 10^6 light years. A light year is the distance traveled by light in one year; if the speed of light is 3 × 10^8 m/s, about how far is it from our galaxy to this hypothetical galaxy? (1 year = 3.15 × 10^7 s)
a. 7E+21 m b. 1E+9 m c. 7E+22 m d. 7E+5 m
If you stand in front of a convex mirror, at the same distance from it as its focal length,
A) you won't see your image because there is none. B) you won't see your image because it is focused at infinity. C) you will see your image and you will appear smaller than you. D) you will see your image and you will appear larger than you. E) you will see your image and it will be the same size as you except upside down.
The equivalent capacitance of the circuit shown below is
a.
0.50 C.
b.
1.0 C.
c.
1.5 C.
d.
2.0 C.
e.
2.5 C.
A circuit containing an AC generator, a capacitor, an inductor, and a resistor has a high-Q resonance at 1 000 Hz. From greatest to least, rank the following contributions to the impedance of the circuit at that frequency and at lower and higher frequencies. Note any cases of equality in your ranking
(a) XC at 500 Hz (b) XC at 1 500 Hz (c) XL at 500 Hz (d) XL at 1 500 Hz (e) R at 1 000 Hz
1.(c) > (d) > (a) > (e) > (b) 2.(a) > (d) > (b) > (c) > (e) 3.(b) > (c) > (a) > (d) > (e) 4.(d) > (a) > (e) > (c) > (b)