Biomass should not be used to produce feedstocks because of the energy expense involved
What will be an ideal response?
In many cases, the reverse is operative; biomass makes the feedstocks at a lower
energy cost, not even to mention the decreased pollution associated with human-designed
feedstock systems.
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One explanation of the dark sky Olbers's Paradox is that light can reach us only from objects in space out to a distance in light years _______ the age of the universe in years
a. less than b. greater than c. equal to d. less than or equal to e. greater than or equal to
A light bulb is in front of a converging lens, creating a well-focused image of the light bulb on the screen on the opposite side of the lens. If the light is moved farther from the lens, how can the screen be adjusted to keep the image in focus?
A. The screen should be moved further from the lens. B. The screen should be made larger, but in the same place. C. The screen should be moved closer to the lens. D. No changes need to be made to the screen.
Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore,
A) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A. B) both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A. C) both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B. D) both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.
Occurs when a pollutant from a single source enters a stream
What will be an ideal response?