The concept that the direction of observation does NOT matter overall is
A) universality.
B) homogeneity.
C) geometry.
D) isotropy.
E) relativity.
D
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Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. When they hit the ground:
A) both will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have half the kinetic energy of the lighter one. E) the heavier one will have one-fourth the kinetic energy of the lighter one.
The most common mineral in Earth's crust is ________, and the second most common mineral is ________
A) quartz; feldspar B) feldspar; quartz C) silicate; carbonate D) olivine; feldspar
If a proton and an electron have the same de Broglie wavelengths, which one is moving faster?
A) the electron B) the proton C) They both have the same speed.
Why do astronomers narrow their search to the "habitable zone" of other star systems?
a. the most likely place to support planets with thick atmospheres b. the least likely place to have zero ultraviolet radiation c. the most likely place with liquid water, and extraterrestrial life d. the most likely place to have oxygen in the atmosphere e. the least likely place to have wide temperature ranges on the surfaces of planets