A 2.0-?F capacitor in series with a 2.0-k? resistor is connected to a 60-Hz ac source. Calculate the impedance of the circuit
a. 1 500 ohms
b. 1 800 ohms
c. 2 100 ohms
d. 2 400 ohms
e. 8 600 ohms
d
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What is the potential difference VB ? VA when I = 0.50 A in the circuit segment shown below?
a.
+28 V
b.
+2.0 V
c.
?28 V
d.
?2.0 V
e.
+18 V
Which answer below is not a statement of the second law of thermodynamics?
A. Real processes proceed in a preferred direction. B. Energy does not flow spontaneously by heat from a cold to a hot reservoir. C. The entropy of the universe increases in all natural processes. D. In theory, heat engines working in a cycle employ reversible processes. E. You cannot construct a heat engine, operating in a cycle that does nothing but take heat from a reservoir and perform an equal amount of work.
Generation of photochemical smog involves the reaction of unburned hydrocarbons with sunlight in a closed basin
What will be an ideal response?
A space station out beyond the solar system is rotating with constant angular velocity. A spaceship heading into the station along a diameter of the station, uses its rockets to brake, and then docks inside the station at its center. When the spaceship docks, the angular momentum of the system consisting of the station and ship
a. is less than the original angular momentum of the station. b. is the same as the original angular momentum of the station. c. is greater than the original angular momentum of the station. d. is less than the original angular momentum of the station, but the angular velocity increases. e. is greater than the original angular momentum of the station, but the angular velocity decreases.