A 200-volt battery is connected to a 0.50-microfarad parallel-plate, air-filled capacitor. Now the battery is disconnected, with care taken not to discharge the plates. Some Pyrex glass is then inserted between the plates, completely filling up the space. What is the final potential difference between the plates? (The dielectric constant for Pyrex is k = 5.6.)
36 V
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Betelgeuse is the bright red star representing the left shoulder of the constellation Orion. All the following statements about Betelgeuse are true. Which one can you infer from its red color?
A) It is much brighter than the Sun. B) Its surface is cooler than the surface of the Sun. C) It is much more massive than the Sun. D) It is moving away from us.
Collisions between galaxies is thought to
A) have stopped about 5 billion years ago. B) be commonplace. C) have never occurred. D) be extremely rare. E) have only occurred between 10 and 15 billion years ago.
The battery powering a light bulb is disconnected. As the light bulb's heat dissipates, how will the resistance and current change?
1.The resistance will decrease and the current will increase. 2.The resistance will increase and the current will be zero. 3.The resistance will increase and the current will decrease. 4.The resistance will decrease and the current will be zero.
Compared to our Sun, a typical white dwarf has
A) about the same mass and density. B) about the same mass and a million times higher density. C) a larger mass and a 100 times lower density. D) a smaller mass and half the density. E) a smaller mass and twice the density.