How do active and passive solar hot-water heaters work?
What will be an ideal response?
"A solar collector for heating water consists of a thin, broad box with a glass or clear plastic top and a black bottom with water tubes embedded within. Such collectors are called flat-plate collectors. Faced toward the Sun, the black bottom gets hot as it absorbs sunlight . . . and the clear cover prevents the heat from escaping." Water is thus heated and is conveyed to a tank where it is stored. In an active system, the heated water is moved by means of a pump. In a passive system, natural convection currents are used."
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The Colorado River provides electricity to people in ____ state(s).
A. 1 B. 7 C. 20 D. 35 E. 50
Which of the following is a characteristic of a terrane?
A. The layers and fossils in a terrane can be matched with those in adjacent areas. B. A terrane has the same sequence of rocks as adjacent areas. C. The boundaries of a terrane are generally major faults or shear zones. D. To be a terrane, the rocks must form in a deep marine environment. E. None of these choices are correct.
The partial pressure of water vapor is called the ____.?
a. ?real vapor pressure b. ?true vapor pressure c. ?actual vapor pressure d. ?actual water pressure e. ?true liquid pressure
Which of the following variables is not taken into consideration when assigning a Mercalli value?
A. earthquake magnitude B. elevation C. foundation materials D. building Style E. distance from the hypocenter/epicenter