In simple harmonic motion, when is the magnitude of the acceleration the greatest? (There could be more than one correct choice.)
A) when the kinetic energy is a minimum
B) when the displacement is a zero
C) when the speed is a maximum
D) when the potential energy is a maximum
E) when the magnitude of the displacement is a maximum
A, D, E
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Astronomers describe the brightness of stars using the brilliance scale
a. True b. False Indicate whether the statement is true or false
In the Orion constellation are stars Rigel, a blue supergiant, and Betelgeuse, a red supergiant. Which star has a greater surface temperature?
A. Rigel B. Betelgeuse C. They have the same surface temperature. D. There is not enough information to tell.
Compared with the amount of current in the filament of a lamp, the amount of current in the connecting wires is
A) definitely less. B) often less. C) actually more. D) the same. E) incredibly, all of the above
In an AC circuit operating at a frequency where the phase angle with respect to the current is 30°, what happens to the phase angle if the capacitance of the circuit is increased?
a. It increases. c. nothing b. It decreases. d. It decreases and can become zero.