What is an ionization nebula?
A) a name sometimes used to describe spiral galaxies besides the Milky Way
B) a region of very hot, low-density gas surrounding a recent supernova
C) a clump of gas that will soon give birth to a new star
D) a colorful cloud of gas that glows because it is heated by light from nearby hot stars
D
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Astronomers sometimes make use of "neutrino telescopes," which are typically located deep underground. What are neutrinos?
A) a type of light-weight subatomic particle B) a very high-energy form of light C) a very low-energy form of light D) a type of wave predicted to exist by Einstein's general theory of relativity
A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally before striking the water, assuming negligible air effects?
A) 14 m B) 16 m C) 20 m D) 24 m
Two parallel conductors are carrying currents in the same direction. The currents are non-zero and not necessarily equal. The magnitude of the magnetic field midway between them is 40 ?T. If one of the currents then has its direction reversed, what is the resulting magnitude of the magnetic field midway between them?
a. a value greater than 40 ?T b. 40 ?T c. a value less than 40 ?T d. It could be any value.
On an alien planet, an object moving at 4.0 m/s on the horizontal ground comes to rest after traveling a distance of 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what is the value of g on that planet?
A) 4.0 m/s2 B) 6.0 m/s2 C) 8.0 m/s2 D) 10 m/s2 E) 12 m/s2