Which two things are the same for all observers according to the theory of relativity?
A) (1) the laws of nature and (2) the speed of light
B) (1) the laws of nature and (2) the rate at which time proceeds
C) (1) the speed of light and (2) the simultaneity of events
D) (1) the rate at which time proceeds and (2) the simultaneity of events
E) (1) the size of moving objects and (2) the mass of moving objects
A) (1) the laws of nature and (2) the speed of light
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Metamorphism occurs for which class of rocks?
a. Metamorphic only b. Sedimentary only c. Igneous only d. All of the above
When a brittle material reaches the fracture stress, the increase in energy necessary to extend a crack in the material is equal to _________.
Fill in the blank(s) with the appropriate word(s).
Why do astronomers believe supermassive black holes are the source of an AGN's energy?
a. Such black holes have been found at the center of most galaxies both active and inactive. b. Radio jets are seen from low mass black holes plus accretion disks inside our galaxy. c. jets and accretion disks have been observed in active galaxies d. black holes can produce so much energy in such a small place. e. all of the above
In which type of collision is the most kinetic energy lost?
A. A perfectly elastic collision B. A perfectly inelastic collision C. A partially inelastic collision D. Kinetic energy is always conserved