If long-distance electric transmission lines are over 99% efficient, why should anyone be excited by the prospect of superconducting transmission lines?
What will be an ideal response?
Any savings is important. Especially important is the distinction between long
distance and short-distance transport of electricity. Short-distance transmission is
considerable more expensive and inefficient than the 99% cited above (which applies to
long-distance transport). If local transmission could be done with no losses, considerable
energy and money could be saved.
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How will high tides differ from their average values when the Moon is in its full phase?
A. They will be higher than average. B. They will be lower than average. C. They will not differ from average values significantly. D. There are no high tides when the Moon is full.
The primary mirror in an astronomical telescope must be a
a. half-silvered mirror. b. convex mirror. c. concave mirror. d. plane mirror.
If a source of sound is traveling toward you, the speed of the sound waves reaching you is _______________ the speed the sound waves would have had if the source were stationary
a. faster than b. slower than c. the same as
Stellar parallax occurs in much the same way as parallax on Earth, with greater parallax for stars that are nearer. Return to the main "Parallax" screen, and from here select the "Stellar Parallax" button, and watch how the motion of the star changes in the "View from Earth" window. Which statement best summarizes why stellar parallax occurs?
A. We view nearby stars from different positions in Earth's orbit at different times of year. B. We view nearby stars from different positions on Earth as Earth rotates on its axis. C. Nearby stars move in tiny circles as Earth orbits the Sun. D. Nearby stars move at higher speeds relative to the Sun than more distant stars.