What is the power factor for a series ac circuit containing a 50-? resistor, a 10-?F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?
A) 0.00 B) 0.46 C) 1.0 D) 0.79
B
You might also like to view...
What type of stresses broke Earth's lithosphere into plates?
A) impacts of asteroids and planetesimals B) internal temperature changes that caused the crust to expand and stretch C) the circulation of convection cells in the mantle, which dragged against the lithosphere D) cooling and contracting of the planet's interior, which caused the mantle and lithosphere to be compressed E) volcanism, which produced heavy volcanoes that bent and cracked the lithosphere
Since radiation interacts with matter in individual particle-like impacts called photons, why does light seem continuous to us?
A) Each photon is spread out over a large region of space and these regions overlap each other. B) Because there are so many photons in a light beam and each carries such a small amount of energy. C) Each photon has a very wide range of energies, and these energy ranges overlap each other. D) Because of the way that the photons interact with each other. E) Because there are so few photons in a light beam and because they each carry such a large amount of energy.
A person weighs 155 pounds. What is the person's weight in Newtons?
A. 155 N B. 689 N C. 39.3 N D. 392 N
You discover a binary star system in which one star is a 15 MSun main-sequence star and the other is a 10 MSun giant. How do we think that a star system such as this might have come to exist?
A) The giant must once have been the more massive star, but it is now less massive because it transferred some of its mass to its companion. B) Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main-sequence stars millions of years later than its less massive companion. C) The two stars probably were once separate, but became a binary when a close encounter allowed their mutual gravity to pull them together. D) The two stars are simply evolving normally and independently, and one has become a giant before the other.