Impedance: What resistance is needed in a series circuit with a 20-mH coil and 1.0-?F capacitor for a total impedance of 100 ? at 1.5 kHz?
A. 0.16 k?
B. 82 ?
C. 57 ?
D. 18 ?
Answer: C
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The point in Earth's orbit where Earth is farthest from the Sun is known as perihelion. precession. the winter solstice. aphelion. a and d.
a. aphelion.
b. perihelion.
c. precession.
d. the winter solstice
e. a and d
The contemporary explanation of the big bang states that early profound changes happened incredibly fast, sometimes in fractions of a second, at multibillion-degree temperatures.
a. true b. false
For every ton of coal burned, the approximate amount of CO2 injected into the atmosphere is
A) a few pounds. B) a ton. C) between 3 and 4 tons. D) half a ton. E) none, because the CO2 is recovered in solid form.
A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2 . What area must be removed form the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10^-6 (°C)-1.)
a. 0.079 3 cm2 b. 0.159 cm2 c. 0.238 cm2 d. 0.841 cm2 e. 0.921 cm2