As material flows into a black hole
a. the material will experience time dilation.
b. the material will become hotter.
c. the material will produce an absorption spectrum.
d. the material will appear to us to fall into the black hole very rapidly.
e. a and b
E
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Coil 1, connected to a 100-? resistor, sits inside coil 2 . Coil 1 is connected to a source of 60 cycle per second AC current. Which statement about coil 2 is correct?
a. No current will be induced in coil 2. b. DC current (current flow in only one direction) will be induced in coil 2. c. AC current (current flow in alternating directions) will be induced in coil 2. d. DC current will be induced in coil 2, but its direction will depend on the initial direction of flow of current in coil 1. e. Both AC and DC current will be induced in coil 2.
Which of the following describes tectonics?
A) the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface B) the eruption of molten rock from a planet's interior to its surface C) the disruption of a planet's surface by internal stresses D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather
If the mass of Mars is 0.107 times that of Earth, and its radius is 0.530 that of Earth, estimate the gravitational acceleration g at the surface of Mars. (gearth = 9.80 m/s2)
a. 2.20 m/s2 b. 3.73 m/s2 c. 4.20 m/s2 d. 5.50 m/s2
The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464?. Which one of the following numbers could be the principal quantum number n of the electron?
A) 0 B) 1 C) 2 D) 3 E) 4