Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below. Which statement is correct?
?
a.
A has the greatest speed and the greatest acceleration.
b.
C has decreasing speed.
c.
D slows down and then speeds up.
d.
D speeds up and then slows down.
e.
E has a greater speed than A.
d
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The direction of the magnetic field of a bar magnet is
a. in the direction opposite to that in which a compass would point. b. in any direction. c. toward the south pole. d. toward the north pole.
In his calculations, Bohr came across a number now called the "Bohr radius". This number is 5.29 X 10-11 m and is
Which of the following statements comparing open and globular star clusters is true?
A) Stars in open clusters are relatively young, while stars in globular clusters are very old. B) Open clusters are found both in the disk and the halo of the galaxy, while globular clusters are found only in the halo. C) Globular clusters typically contain a few hundred stars, while open clusters typically contain tens to hundreds of thousands of stars. D) Open clusters contain only main-sequence stars, while globular clusters contain only giants.
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.