If the density of the universe is greater than critical, then
A) the universe will end up as nothing but black holes.
B) the universe will continue expanding forever.
C) there is more matter than energy.
D) the universe is closed, gravity wins, and will shrink to the Big Crunch.
E) the universe is flat, and Euclid is right.
D
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A train station bell gives off a fundamental tone of 1000 Hz as the train approaches the station at a speed of 20.0 m/s. If the speed of sound in air is 335 m/s, what will be the apparent frequency of the bell to an observer riding the train?
a. 1060 Hz c. 943 Hz b. 1070 Hz d. 940 Hz
Rills on the Moon are believed to have been caused by
a. moonquakes. b. meteorite impacts. c. volcanoes. d. expansion and contraction of the Moon's surface.
Two long, parallel wires each carry the same current I in the same direction (Fig. OQ30.4). The total magnetic field at the point P midway between the wires is:
The power factor of an RLC series circuit _______ at resonance.
A. is one B. has a value that depends upon the ratio of inductive reactance to impedance C. has a value that depends upon the ratio of capacitive reactance to impedance D. is zero