The Cenozoic Era is known as the
A) age of the mammals.
B) age of man.
C) age of the reptile.
D) ice age.
Answer: A
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Which of the following is not one of the ways sound can be used?
a. to circulate the refrigerant in a refrigerator b. to relay information to orbiting satellites c. to form images of internal organs d. to measure the air temperature aloft e. to make a bubble in water produce light
A charge of 20 nC is distributed uniformly along the x axis from x = ?2.0 m to x = +2.0 m. What is the electric potential (relative to zero at infinity) at the point x = 5.0 m on the x axis?
A. 57 V B. 48 V C. 38 V D. 67 V E. 100 V
Two speakers are placed side by side and driven by the same frequency of 0.50 kHz. If the distance from a person to one speaker is 5
0 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? The sound speed in the room is 340 m/s. A) 7.7 m B) 8.1 m C) 8.4 m D) 9.1 m
The flatness problem and horizon problem
a. are solved if there was a sudden inflation of the Universe at time before recombination occurred. b. show that the Universe can be described as static and unchanging. c. show that dark matter must be a small fraction of the total mass of the Universe. d. imply that the Universe was once much colder than it is now. e. imply that the inflationary theory is incorrect.