Why is volcanism associated with regions where one plate descends below another plate?
What will be an ideal response?
A plate sliding into a subduction zone can trigger volcanism.
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High-voltage wires in power lines are not high-current wires because the current in them is
A) not the same as the current that powers the distant load. B) proportional to the voltage drop from beginning to end of each line, rather low. C) both of these D) neither of these
Answer the following statement(s) true (T) or false (F)
1. Suppose you are in a train traveling at one-half of the speed of light relative to the earth. Assuming that photons emitted by the train’s headlight travel at the speed of light relative to you, they would (according to the Galilean velocity transformation) travel at 1.5 times the speed of light relative to the earth. 2. Suppose you are in a spaceship traveling at twice the speed of light relative to the earth. Assuming that the Galilean transformation equations are true and the earth is approximately at rest relative to the ether, light from the ship’s taillight will never reach the ship’s bridge at its front end.
A recovery _________is when a strain-hardened metal is heated to an elevated temperature and the ductility is increased, but no new grains form.
Fill in the blank(s) with the appropriate word(s).
"Hybrid drive" automobiles use
A) hydrogen fuel that burns much like gasoline within an engine that drives the wheels. B) natural gas fuel stored at high pressure. C) a small gasoline engine that drives an electric generator. D) large storage batteries that are recharged by plugging them into a wall socket. E) small batteries that energize a small gasoline engine that drives the wheels.