Why can't we see the center of our galaxy with our eyes?
A) We are in the center of the Milky Way.
B) There are no stars in the center of the Milky Way, just a supermassive black hole.
C) Interstellar dust and gas absorbs and scatters visible light before it can reach us from the center.
D) The center of the Milky Way does not emit enough visible light.
E) Stars are too densely spaced in the plane of our galaxy to see all the way to the center.
C) Interstellar dust and gas absorbs and scatters visible light before it can reach us from the center.
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At temperatures above the equi-cohesive temperature, the creep mechanism of grain boundary _________is observed.
Fill in the blank(s) with the appropriate word(s).
Commonly used units for solar energy input are
a. watts b. watts/day c. watts/day/m2 d. Btu e. Btu/ft2/day
The amplitude of a system moving with simple harmonic motion is doubled. The total energy will then be
a. 4 times as large b. 3 times as large c. 2 times as large d. the same as it was e. half as much
A device that transforms electrical energy to mechanical energy is
1) a generator, 2) a motor, 3) a transformer, 4) any common magnet, and a device that transforms mechanical energy into electrical energy is a 5) generator. 6) motor. 7) transformer.