If you were to unscrew bulb B from its socket (effectively removing it from the circuit and leaving a gap in its place), bulb A would
A. get brighter.
B. become dimmer.
C. remain at the same brightness.
D. go out.
C. remain at the same brightness.
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A resistor is connected to an ideal ac power supply. (a) The phase angle between the current and voltage is A. 0 B) ?/2 radians. C) -?/2 radians. D) ? radians. E) 3?/4 radians
(b) The current in the resistor A. leads the voltage across the resistor by 90°. B) lags the voltage across the resistor by 90°. C) is in phase with the voltage across the resistor. D) the voltage across the resistor by 45°. E) lags the voltage across the resistor by 45°. (c) How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases? A. It decreases. B) It increases. C) It does not change. D) It increases or decreases depending on the sign of the phase angle.
The Sun is a star in the Milky Way Galaxy
a. True b. False Indicate whether the statement is true or false
What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?
A) 1 m/s2 B) 2 m/s2 C) 3 m/s2 D) 4 m/s2 E) 5 m/s2
A negatively charged rod is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod will be charged
A) positive. B) negative. C) neutral. D) none of the given answers