Complete destructive interference occurs for two waves of the same amplitude and frequency when the waves are ______________ degrees out of phase
Fill in the blank(s) with correct word
180
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Carnot Engine: The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20°C as the hot temperature reservoir, and the water at some depth, with a temperature of 5.0°C, as the cold temperature reservoir for a heat engine. What is the maximum possible efficiency of an engine running between those two temperatures?
A. 4.7% B. 5.1% C. 7.9% D. 15% E. 30%
The normal U.S. average annual radiation dose per person is about how many REM?
What will be an ideal response?
Stony meteorites are common among falls
a. True b. False Indicate whether the statement is true or false
Both RR Lyrae and Cepheid variable stars are stars that, when on the main sequence, were considered to be:
A) low mass. B) intermediate mass. C) high mass. D) zero-age main sequence. E) blue stragglers.