Which of the following is not considered a fundamental particle?
A) a proton
B) an electron
C) an up quark
D) a neutrino
A) a proton
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The Solar System is located about ________ from the center of the Milky Way.
A. 8 light-years B. 8 kiloparsecs C. 8 parsecs D. 8 AU
Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?
A. A comparison is impossible unless they are both floating at the same level. B. Fish A displaces a greater quantity of water than fish B. C. Fish B displaces a greater quantity of water than fish A. D. They both displace the same quantity of water. E. Fish A has a smaller acceleration than Fish B when equal horizontal forces are applied to each, because Fish A weighs more.
The assumption that from any place in the universe the observer would measure the same physical properties we observe is called
A) Olbers's paradox. B) general gelativity. C) special relativity. D) steady state physics. E) the cosmological principle.
Radio telescopes have poor resolving power because:
A) they have the smallest diameters. B) they cannot measure wavelengths larger than 102 m. C) radio waves have long wavelengths. D) radio waves have small diffraction fringes.