When dark matter first became popular, many astronomers thought that was greater than one from the extra gravity, favoring what type of Universe?
What will be an ideal response?
This would have favored a closed or spherical Universe that would eventually collapse back on itself.
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The ________ hypothesis is that the Earth does not occupy any special place in the universe
A) Galilean B) Pythagorean C) Aristotelian D) Copernican E) Ptolemaic
A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance
After the rod is separated, the rod A) is repelled by the sphere. B) is attracted to the sphere. C) feels no force due to the sphere.
If the mass of the Sun were smaller by a factor of 1/3, how would the force between the Sun and the Earth change?
A) it would remain unchanged B) it would decrease by a factor of three C) it would triple D) it would decrease by a factor of nine E) it would be nine times more
Consider two copper wires. One has twice the length and twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The longer wire has twice the resistance of the shorter wire. C) The longer wire has four times the resistance of the shorter wire. D) The shorter wire has four times the resistance of the longer wire. E) The shorter wire has twice the resistance of the longer wire.