Observations of radio waves from astronomical objects suffer from poorer resolution than visible observations with the same size dish (or mirror) because
a. the signals are so weak in the radio region.
b. the wavelength of radio waves is much longer than the wavelengths of visible light.
c. radio telescopes are generally much smaller in diameter than optical telescopes.
d. it is very difficult to detect radio waves.
e. radio telescopes don't use solid mirrors.
b
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The stars farther than 20 000 LY from the center of the Milky Way are traveling too fast to be bound to the galaxy by the observed mass of the galaxy. Which of the following are currently being investigated as possible explanations of this?
a. neutrino mass b. WIMPs c. Newtonian dynamics are not quite correct. d. all of the above
By what factor is the capacitance of a metal sphere multiplied if its volume is tripled?
1.3 2.31/3 3.1 4.3-1/3 5.13
A block of wood is floating in water with 2/3 of its volume below the water line. The density of the wood is
A. equal to 3/2 the density of water B. equal to 2/3 the density of water C. equal to 1/3 the density of water D. equal to the density of water since it is floating
When the Sun runs out of nuclear fuel and expands to become a red giant,
A) the Earth's oceans will freeze solid B) the Earth will be ejected from the solar system C) the Earth will be destroyed D) the Earth will experience a runaway greenhouse effect followed by the total loss of its atmosphere