Metamorphism caused by the alteration of rock by both thermal and mechanical means is called
A) contact metamorphism.
B) dynamic metamorphism.
C) regional metamorphism.
D) none of the above
Answer: C
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A power transmission line 50. km long has a total resistance of 0.60 ?. A generator produces 100. V at 70. A
In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. (a) What percentage of the original energy is lost when the transformer is used? (b) What percentage of the original energy would be lost if the transformer were not used?
During a snowball fight two balls with masses of 0.30 and 0.70 kg, respectively, are thrown in such a manner that they meet head-on and combine to form a single mass. The magnitude of initial velocity for each is 12.0 m/s. What is the speed of the 1.0-kg mass immediately after collision?
a. zero b. 4.8 m/s c. 12 m/s d. 8.4 m/s e. 3.6 m/s
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What will be an ideal response?
On the H-R diagram, red supergiants like Betelguese lie:
A) at the bottom left. B) at the bottom right. C) at the top left. D) at the top right. E) They can't be plotted, for they are not main sequence.