Briefly discuss some of the uses for capacitors in electronic circuits
What will be an ideal response?
Capacitors are devices that can store electric charge. They store charge for later use, such as in a camera flash, and as energy backup in computers if the power fails. Capacitors can also block surges of charge and energy to protect circuits. Very tiny capacitors serve as memory for the "ones" and "zero" of the binary code in the random access memory of computers.
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What would happen if Jupiter was suddenly replaced by a black hole with the same mass as Jupiter?
A) The orbits of the planets in our solar system would be unaffected. B) The other planets would slowly be pulled into Jupiter, but the Sun would be unaffected. C) The other planets and the Sun would slowly be pulled into Jupiter. D) The entire solar system would rapidly be sucked into the black hole.
To drop a package to Earth from a satellite, project it
A) straight downward. B) ahead at satellite speed. C) behind at satellite speed. D) none of the above
A campus bird spots a member of an opposing football team in an amusement park. The football player is on a ride where he goes around at angular velocity ? at distance R from the center. The bird flies in a horizontal circle above him. Will a dropping the bird releases while flying directly above the person's head hit him?
a. Yes, because it falls straight down. b. Yes, because it maintains the acceleration of the bird as it falls. c. No, because it falls straight down and will land behind the person. d. Yes, because it maintains the angular velocity of the bird as it falls. e. No, because it maintains the tangential velocity the bird had at the instant it started falling.
What do we mean when we say that the universe is expanding?
A) Everything in the universe is gradually growing in size. B) Within galaxies, average distances between star systems are increasing with time. C) The statement is not meant to be literal; rather, it means that our knowledge of the universe is growing. D) Average distances between galaxies are increasing with time.