In the field, you find an unidentified mineral that is clear, exhibits conchoidal fracture, and can scratch glass. This mineral is most likely:
-gypsum.
-calcite.
-quartz.
-hornblende.
-muscovite.
-quartz.
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A light ray enters a glass enclosed fish tank. From air it enters the glass at 20.° with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33
(a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?
All the following statements about Venus are true. Which one offers evidence of a global repaving about a billion years ago?
A) Venus's largest features are three elevated regions that look somewhat like continents. B) Venus has many circular features, called coronae, which appear to be tectonic in origin. C) Venus appears to lack any water that could lubricate the flow of rock in its crust and mantle. D) Venus has relatively few impact craters and these craters are distributed fairly evenly over the entire planet.
A light board, 10 m long, is supported by two sawhorses, one at one edge of the board and a second at the midpoint. A 40-N weight is placed between the two sawhorses, 3.0 m from the edge and 2.0 m from the center
What forces are exerted by the sawhorses on the board?
You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to
A) 28 m/s B) 20 m/s C) 40 m/s D) 37 m/s