Crater Lake, atop Mount Mazama in Oregon, occupies a volcanic
a. caldera.
b. fissure.
c. vent.
d. fumarole.
a
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Double-Slit Interference: A pair of narrow slits that are 1.8 mm apart is illuminated by a monochromatic coherent light source. A fringe pattern is observed on a screen 4.8 m from the slits. If the wavelength of the monochromatic light is 450 nm, what is the angular separation between adjacent dark fringes on the screen, measured in milliradians?
A. 0.15 mrad B. 0.20 mrad C. 0.25 mrad D. 0.30 mrad E. 0.36 mrad
Arrhenius was not particularly alarmed by his discovery at the time. What changed that made later scientists become much more concerned about the climate effects of carbon dioxide?
A. Emissions of carbon dioxide rose much faster than Arrhenius had anticipated. B. Scientists discovered errors in Arrhenius’s calculations that made the effects of carbon dioxide much greater than he had expected. C. Scientists became concerned about carbon dioxide only after measurements showed the world was warming substantially. D. Scientists discovered that there is much more natural carbon dioxide in the atmosphere than Arrhenius had thought.
Matter flowing into a black hole cools until it is accelerated into a jet
a. True b. False Indicate whether the statement is true or false
A solid wooden door, 90 cm wide by 2.0 m tall, has a mass of 35 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20 m/s and hits the door 60 cm from the hinged side, causing it to begin turning
The ball rebounds along the same line with a speed of 16.0 m/s relative to the ground. How much mechanical energy is converted to internal energy during this collision? A) 30 J B) 16 J C) 15 J D) 13 J E) 4.8 J