The cosmic speed limit, the speed of light is established by
A) Newton's Laws of Motion
B) Einstein's General Theory of Relativity
C) Einstein's Special Theory of Relativity
D) Kepler's Laws of Planetary Motion
C
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A 100 kg mass has a density of 2000 
If the volume is decreased by 2% due to compression, then the density is
A. 3,010 
B. 2,940
C. 2,520
D. 2,440
E. 2,040
One observation that supported an Earth-centered solar system is ________.
A. the shape of Earth's shadow on the Moon B. the phases of the Moon C. retrograde motion D. the phases of Venus E. the lack of parallax in the stars
When a star finally runs out of hydrogen to fuse in its central core
A) it grows smaller and dimmer, becoming a brown dwarf B) it grows larger and brighter, becoming a giant or supergiant star C) it grows smaller and dimmer becoming a white dwarf D) it remains the same size but grows brighter
Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless, level surface. Attached to the 8.0-kg mass is a second light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 1.0 m/s2, what is the tension in the second string attached to the 8.0-kg mass?
a. 14 N c. 28 N b. 6.0 N d. 4.0 N