The Oort cloud is
A) a roughly spherical region larger than the orbit of Pluto that may contain a trillion comets.
B) a region in the same plane as the planets that contains hundreds of thousands of comets.
C) a circular region between the orbits of Mars and Jupiter that contains most known asteroids.
D) the cloud of gas from which the solar system formed.
E) a vast cloud of gas that encircles the solar system at a great distance from the Sun.
A) a roughly spherical region larger than the orbit of Pluto that may contain a trillion comets.
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Variable stars are ones whose ________ changes over time
Fill in the blank(s) with correct word
Heat transfer from hot or cold liquids in a thermos bottle is prevented by ______________
a. convection b. conduction c. radiation d. all of these
A car traveling at constant speed has a net work of zero done on it.
Answer the following statement(s) true (T) or false (F)
Which of the following statements best describes Einstein's contributions and views about quantum theory?
A) He didn't make any significant contributions to the theory, but he did accept quantum theory. B) Despite his important work on relativity, Einstein didn't make any important contributions to quantum theory, and furthermore he never really accepted quantum theory. C) Although his work on the photoelectric effect was an important contribution to quantum theory, Einstein never really accepted quantum theory. D) Although his work on the quantum theory of atoms was an important contribution, Einstein never really accepted quantum theory. E) His work on the photoelectric effect was an important contribution to quantum theory, and he accepted the theory as a correct description of the microscopic world.