How does the greenhouse effect affect Earth?
What will be an ideal response?
Soon after Earth formed, it began to cool; once it cooled enough, oceans began to form, and carbon dioxide began to dissolve in the water. The removal of carbon dioxide is critical to Earth because an atmosphere rich in carbon dioxide can trap heat by a process called the greenhouse effect. When visible-wavelength sunlight shines through the glass roof of a greenhouse, it heats the interior. Infrared radiation from the warm interior can't get out through the glass, heat is trapped in the greenhouse, and the temperature climbs until the glass itself grows warm enough to radiate heat away as fast as sunlight enters.
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For a plate in bending, what material provides the highest specific elastic modulus?
(a) Uni-ply CFRP (b) Balsa wood parallel to grain (c) Beryllium (d) Diamond
Which series is shown above?
a. Lyman
b. Paschen
c. Balmer
d. None of the other choices are correct.
Force F, acting for time T and over a distance D, gives impulse I. To get the same impulse using half the force, it would be necessary for the force to act
A. over a distance 4D. B. for a time 2T. C. for half the time T. D. over half the distance D. E. over a distance 2D.
A fish looks up through the smooth surface of the water at a bear directly above it. To the fish,
A. the bear appears to be exactly where it really is. B. the bear appears to be further away than it really is. C. the bear appears to be closer to the point directly above the fish than it really is. D. the bear cannot be seen due to total internal reflection.