Which of the following are not relativistically invariant quantities?
a. the speed of light, c c. mass
b. time d. energy
B, D
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What is the best evidence for a supermassive black hole in the center of the Milky Way Galaxy?
A) amazing filaments of radio emission swirling around the center of the galaxy B) the motions of stars around a mysterious dark object C) The existence of the Milky Way itself: The mass of the black hole is essential to gravitationally bind the galaxy together, so it doesn't fly apart. D) the gigantic bursts of X-ray energy from a mysterious dark object
A solar eclipse that occurs when the Moon's umbra reaches Earth's surface is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral solar eclipse. e. an umbral solar eclipse.
Suppose that the Sun started shrinking in size, without losing any mass. What would be the effect of the Sun's change on the orbits of the planets?
A. The planets would escape. B. The orbits would not be affected. C. The orbits would become larger. D. The orbits would become smaller in size.
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