In the U.S., AC line voltage oscillates at a frequency of __________
Fill in the blank(s) with correct word
60 Hz
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You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it
A) moves along a straight-line path away from the center of the circle. B) moves along a straight-line path toward the center of the circle. C) moves along a straight-line path in its original direction. D) continues to follow a circular path, but with a radius larger than the original radius. E) moves along a path that is neither straight nor circular.
An electron in a hydrogen atom makes a transition from the n = 4 to the n = 3 energy state. Determine the energy (in eV) of the emitted photon
a. 0.54 b. 0.66 c. 0.85 d. 1.51 e. 10.2
The key to identifying a black hole candidate in a binary system is that
A) one of the two stars cannot be seen. B) the unseen companion in the system must have a sufficiently high mass. C) the unseen star is a contact binary. D) the system must be a very strong source of radio emissions. E) the visible companion must be an evolving main sequence or giant star.
A "blown" fuse has
A) moderate resistance. B) zero resistance. C) infinite (very large) resistance.