Geologists view the section of Earth called the ______________ as consisting of a number of close-fitting plates
Fill in the blank(s) with correct word
lithosphere
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The electric field in the dielectric between the plates of a capacitor is E. What is the charge density on the plates?
A. E·V
B. 
C. 
D. 
E. 
Supermassive black holes are believed to be located at the center of many galaxies because
a. the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter. b. the orbital motion of material near the center is very fast and indicates a very massive core. c. the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole. d. the spiral structure requires a black hole to maintain the spiral arms. e. the orbital speeds of a globular clusters in the galaxy are greater than the speed of light.
In England in the Middle Ages an extensive system of canals was used for transportation. Some of these canals crossed over canyons by flowing over bridges (viaducts). Suppose that a heavily loaded barge crossed over such a waterway bridge
A) The force downward on the bridge would increase because of the added weight of the barge. B) The force on the bridge would not change when the barge passed over. C) The force on the barge would become less because some water would be squeezed off of the bridge. D) The force on the bridge would become less because of the buoyancy effect of the water on the barge. E) Whether or not the force on the bridge would increase or decrease would depend on whether the water was flowing or stationary.
Characteristic x-ray spectra come from