Interactions among galaxies also are thought to influence a galaxy's type in at least some cases. Which of the following does not support the idea that interactions can shape galaxies?
A) the presence of features, such as "tails" extending out of galaxies, bridges between galaxies, and rings of stars around galaxies
B) the fact that galaxies with distorted appearances are more common at great distances than nearby
C) computer modeling of collisions between galaxies
D) the fact that more distant galaxies have larger redshifts
D
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As a train starts from rest and then accelerates down the track, coming toward me faster and faster, the speed of the sound waves coming toward me will be
a. slower than the normal speed of sound in air. b. equal to the normal speed of sound in air. c. some constant speed faster than the normal speed of sound in air. d. faster and faster.
A stream of electrons passes through a velocity filter where the crossed magnetic and electric fields are 0.020 T and 5.00 × 10^4 V/m, respectively. Find the kinetic energy (in electron volts) of the electrons passing through the filter. [1 eV = 1.60 × 10^?19 J]
The most abundant element in Saturn's atmosphere is
A) ammonia. B) hydrogen. C) helium. D) methane. E) nitrogen.
The particles in the nucleus referred to as nucleons are
A. electrons and protons. B. protons and neutrons. C. neutrons and electrons. D. electrons and photons.