Why isn't the space within our solar system or the Milky Way expanding according to Hubble's Law?
A) Hubble's law of expansion applies only to the space between galaxies.
B) As we are inside our solar system and the Milky Way, we cannot observe their expansion.
C) The gravity exerted by the solar system and the Milky Way is strong enough to hold them together against the expansion of the universe.
D) The universe is not old enough for the solar system or Milky Way to have begun their expansion.
C
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At the Earth’s orbital distance, the intensity of the solar radiation is approximately 1400 
What is the value for the rms Electric field strength in solar radiation?
A. 726 V/m B. 363 kV/m C. 527 kV/m D. 513 kV/m
Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A) It is doubled. B) It stays the same. C) It is tripled. D) It is quadrupled. E) It is reduced by a factor of two.
A light ray strikes a hexagonal ice crystal floating in the air at a 30° angle to one face, as shown below. The hexagonal faces of the crystal are perpendicular to the plane of the page. All the rays shown are in the plane of the page, and nice = 1.30. Which outgoing ray is the correct one?
A. A B. B C. C D. D E. E
Of the following substances, which one contains the highest density of free electrons?
a. hard rubber b. iron c. amber d. glass