Which of the following is listed in increasing conductivity?
A. doped semiconductors, pure semiconductors, conductors, insulators
B. insulators, doped semiconductors, conductors, pure semiconductors
C. insulators, pure semiconductors, doped semiconductors, conductors
D. conductors, pure semiconductors, doped semiconductors, insulators
C. insulators, pure semiconductors, doped semiconductors, conductors
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A key piece of evidence that leads astronomers to conclude that most galaxies include a supermassive black hole in the center is that ____
a. high-speed disks of gas are observed in the central parsecs of other galaxies b. streamers of gas from stars that have been torn apart are detected in most galactic centers c. stars near the center of other galaxies are orbiting more rapidly than expected d. the mass of all galaxies is much more than expected based on the visible material in the galaxy e. the disks of all spiral galaxies rotate more quickly than Kepler's laws predict
Which planet has the most moons?
a) Earth b) Mercury c) Saturn d) Mars e) Venus
The electric potential inside a charged solid spherical conductor in equilibrium
a. is always zero. b. is constant and equal to its value at the surface. c. decreases from its value at the surface to a value of zero at the center. d. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. e. is equal to the charge passing through the surface per unit time divided by the resistance.
In a machine shop, two cams are produced, one of aluminum and the other of cast iron. Both cams have the same mass. Which cam is larger?
1.both cams have the same size 2.cannot tell from the information given 3.the aluminum cam 4.the iron cam