How can resonance effects in tidal energy systems disrupt the environment?
What will be an ideal response?
Natural systems have developed in the presence of physical rhythms. Adding
dams or other diversions changes the resonant frequencies of the local bodies of water.
Because the life will have adapted to nature as it existed, changing the rhythm will change
the conditions in which the organisms live.
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When an electric current exists within a conducting wire, which of the following statements describes the condition of any accompanying electric field?
a. must be perpendicular to current flow b. must be parallel to current flow c. must be zero d. must be anti-parallel (opposite direction) to current flow
A farsighted person cannot see clearly objects that are closer to her eyes than 60.0 cm
Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable her to comfortably see the objects at a distance of 25.0 cm from her eyes? A) -42.9 cm, +2.33 diopters B) -42.9 cm, -2.33 diopters C) +42.9 cm, +2.33 diopters D) +42.9 cm, -2.33 diopters E) +60 cm, +42.9 diopters
The amount of energy needed to move an electron from a lower energy level to a higher energy level is the ____
a. energy of the higher level b. energy of the lower level c. difference in energy between the two levels d. product of the energies of the two levels e. binding energy
If an R = 1.0-k? resistor, a C = 1.0-?F capacitor, and an L = 0.20-H inductor are connected in series with a V = 150 sin (377t) volts source, what is the maximum current delivered by the source?
a. 0.007 0 A b. 27 mA c. 54 mA d. 0.31 A e. 0.34 A