A series LRC ac circuit has a resistance of 4.0 k?, a capacitance of 33.0 ?F, and an inductance of 23.0 H. If the frequency of the alternating current is 2.0/? kHz, what is the phase angle between the voltage and the current?
A) -1.6 rad B) 23 rad C) 3.1 rad D) 1.5 rad
D
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Briefly explain how antimatter can be produced on Earth.
What will be an ideal response?
In July 2011, the Dawn probe entered orbit around
A) the comet Wild. B) the asteroid Ida. C) the asteroid Ceres. D) the asteroid Gaspra. E) the asteroid Vesta.
You are tuning a guitar by comparing the sound of the string with that of a standard tuning fork. You notice a beat frequency of 5 Hz when both sounds are present. You tighten the guitar string and the beat frequency rises steadily to 8 Hz. To tune the string exactly to the tuning fork, you should
1.continue to tighten the string. 2.loosen the string. 3.impossible to determine from the given information.
Earth's magnetic field is not stable; throughout geologic time it has changed direction. This change is attributed to
A) changes in the direction of fluid flow in the molten outer core of Earth. B) magnetic pole reversals. C) fluctuations in the time / space continuum. D) changes in the direction of fluid flow in the molten inner core of Earth.