It is impossible to use appropriate "run-of-stream" turbines to capture tidal energy
What will be an ideal response?
There are relatively inexpensive models sold by Chinese companies. Also, new
technologies such as the Davis and Gorlov turbines, hold promise of more efficient but
inexpensive run-of-the-stream devices.
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An ideal fluid, of density 900 kg/m3, flows at 4.80 m/s through a level pipe with radius of 0.22 cm. The pressure in the fluid is 1.3 × 10^5 N/m2 . This pipe connects to a second level pipe, with radius of 0.72 cm. Find the speed of flow in the second pipe
a. 51 m/s b. 1.5 m/s c. 0.45 m/s d. 16 m/s e. 4.9 m/s
Imagine comparing a 1.2 solar mass white dwarf to a 1.0 solar mass white dwarf. Which of the following must be true?
A) The 1.2 solar mass white dwarf has a higher surface temperature. B) The 1.2 solar mass white dwarf has a smaller radius. C) The 1.2 solar mass white dwarf has a larger radius. D) The 1.2 solar mass white dwarf is supported by neutron degeneracy pressure; the 1 solar mass white dwarf is supported by electron degeneracy pressure. E) The 1.2 solar mass white dwarf has a lower surface temperature.
A series LR circuit includes a 9.0 V battery, a resistance of 0.50 
and an inductance of 0.80 H. When the switch is closed, how long does it take for the current to reach one half of its maximum value?
A. 0.80 s B. 1.6 s C. 2.3 s D. 1.1 s E. 0.55 s
Process of Science: Scientists have not been able to observe the ultimate fate of our universe. On what evidence do they base the idea that it will expand forever?
What will be an ideal response?