Just as in hydraulic circuits there is water pressure, in electric circuits there is
A) current.
B) voltage.
C) resistance.
Answer: B
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What does Einstein's cosmological constant represent in his equations of general relativity?
A) the value of the expansion rate of the universe B) the value of the acceleration of the universe C) the value that measures the strength of gravity across the universe D) the size of the cosmological horizon E) a repulsive force that can counteract gravity
What is the origin of short gamma ray bursts?
A) the collision of stars in the dense nuclei of distant galaxies B) new stars forming in the Milky Way C) very powerful supernovae occurring in distant galaxies D) supernovae in the Milky Way E) It is not known, but it may be the collision of a neutron star with a black hole.
A ballet dancer is spinning in the middle of a horizontal frictionless stage. Which of the following things could he change by moving parts of his body or his whole body? (There could be more than one correct choice.)
A) his total kinetic energy B) the location of his center of mass (or center of gravity) C) his angular momentum D) the horizontal component of his linear momentum E) his rotational kinetic energy F) his translational kinetic energy G) his moment of inertia
Maxwell guessed that visible light was an electromagnetic wave because of its:
a. energy. c. wavelength. b. frequency. d. speed.