Water flowing through a cylindrical pipe suddenly comes to a section of pipe where the diameter decreases to 86% of its previous value
If the speed of the water in the larger section of the pipe was what is its speed in this smaller section if the water behaves like an ideal incompressible fluid?
A) 37 m/s B) 24 m/s C) 43 m/s D) 28 m/s
C
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Cepheid variable stars stop pulsating when:
A) they evolve out of the instability strip of the H-R diagram. B) they enter the zero-age main sequence. C) they begin their stable lives fusing hydrogen. D) they reach the lower edge of the main sequence of the H-R diagram.
Astronomers believe that gamma-ray bursters emit radiation equally in all directions
Indicate whether the statement is true or false
Black holes suck up all matter in sight
Indicate whether the statement is true or false
Quadrupling the power output from a speaker emitting a single frequency will result in what increase in loudness?
a. 17 dB b. 7.0 dB c. 6.0 dB d. 1.4 dB e. 0.48 dB