Mathematical models indicate that ___________ galaxies are produced by high-speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy
a. ring
b. spiral
c. antenna
d. irregular
e. tidal tail
a
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Our textbook discusses the cosmic calendar, a model of the history of the universe scaled to a single year. The length of time represented by one month on this cosmic calendar is therefore
A) about ten million years. B) about one million years. C) about one billion years. D) about ten billion years. E) about 1000 years.
A person has a mass of 45 kg. How much does she weigh on the Moon, where g = 1.62 m/s 2
A) 45 N B) 73 N C) 7.4 N D 220 N E) 440 N
A rainbow is a result of:
a. different color droplets of water. b. dispersion. c. interference. d. the Huygens Effect.
An uncharged 30.0-µF capacitor is connected in series with a 25.0-? resistor, a DC battery, and an open switch. The battery has an internal resistance of 10.0 ? and the open-circuit voltage across its terminals is 50.0 V
The leads have no appreciable resistance. At time t = 0, the switch is suddenly closed. (a) What is the maximum current through the 25.0-? resistor and when does it occur (immediately after closing the switch or after the switch has been closed for a long time)? (b) What is the maximum charge that the capacitor receives? (c) When the current in the circuit is 0.850 A, how much charge is on the plates of the capacitor?