Two speakers emit coherent sound waves into the open air. One of them produces 75 W of power. If a microphone placed at 12 m from each of the two speakers receives a total intensity of 0.25 
what is the power output of the second speaker?
A. 151 W
B. 377 W
C. Need more info to solve.
D. 38 W
B. 377 W
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A. 1 B. 2 C. 3 D. 4 E. 5
The parallax of two stars is reported in a star catalog. Which star is farther?
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When a metamorphic rock is eroded and then becomes deposited at the bottom of an ocean it turns into
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