Is gasahol a good idea? Explain
What will be an ideal response?
It depends very much on how much fossil fuel energy is used to make the
ethanol. In Brazil, it is generally agreed that ethanol is energy-efficient because the thermal
energy is supplied by bagasse (woody waste from sugar cane) and even vinesse (liquid
waste from sugar cane). However, in the United States, fossil fuels are used and many
observers think there is a greater fossil fuel energy input than the output of ethanol. In any
case, it is far less efficient to make ethanol in the United States.
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The equator receives the same amount of sunlight from season to season
a. True b. False Indicate whether the statement is true or false
An annular eclipse of the Sun occurs when the Moon doesn't quite cover the Sun in the zone of totality. This means that the Moon is
A) closer than usual to Earth. B) farther than usual from Earth. C) none of these
A ball is thrown straight up with a speed of 36 m/s. How long does it take to return to its starting point, assuming negligible air resistance?
A) 3.7 s B) 7.3 s C) 11 s D) 15 s
In a 3d subshell, what are the possible values for the magnetic quantum number?
A. 3 B. 3, -3 C. 3, 2, 1, 0 D. 2, 1, 0, -1, -2 E. 2, -2