Movement of water erodes stream channels. The main source of erosion comes from
A) physical abrasion.
B) chemical erosion.
C) laminar flow.
D) lithification.
Answer: A
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A parallel-plate capacitor is attached to a fixed voltage supply. If the plates are then separated to double the initial value, what happens to the energy stored by the capacitor?
a. It halves, go figure! b. It stays the same since the volume doubles while the electric field halves. c. It doubles since the volume between the plates doubles. d. It quadruples since both the volume and the field double in this case.
Galileo's discovery of four moons orbiting ________ provided new support for the ideas of Copernicus
Fill in the blank(s) with correct word
Light being amplified by stimulated emission of radiation is the principle of the photoelectric effect
a. True b. False Indicate whether the statement is true or false
Why don't low-mass stars have the CNO cycle occurring in their cores?
A) The CNO cycle makes elements heavier than carbon, nitrogen, and oxygen. B) They don't have enough carbon, nitrogen, and oxygen. C) Their core temperatures are too low.