Supermassive black holes have weaker gravity than stellar-mass black holes, producing slower spins for the infalling matter
a. True
b. False
Indicate whether the statement is true or false
False
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The average size of a white dwarf is about the same size as the Earth
Indicate whether the statement is true or false
A laser beam is emitted on earth (event A), bounces off a mirror placed on the moon by Apollo astronauts (event B), and then returns to a detector on earth (event C). The detector is 12 ns of distance from the laser.
(a) The space time interval between events A and B is: A. Time like B. Light like C. Space like
The following statements are all true. Which one counts as an "exception to the rule" in being unusual for our solar system?
A) Venus does not have a moon. B) Jupiter has a very small axis tilt. C) Saturn has no solid surface. D) The diameter of Earth's Moon is about 1/4 that of Earth.
Three particles of equal charge, X, Y, and Z, enter a uniform magnetic field B. X has velocity of magnitude v parallel to the field. Y has velocity of magnitude v perpendicular to the field. Z has equal velocity components v parallel and perpendicular to the field. Rank the radii of their orbits from least to greatest.
A.
B.
C.
D.
E.
.