Unpolarized light is passed through polarizer 1 . The light then goes though polarizer 2 with its plane of polarization at 44.0° to that of polarizer 1 . What fraction of the intensity of the original light gets though the second polarizer?
a. 0.360
b. 0.518
c. 0.259
d. 0.720
e. 0.500
c
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Materials with a room-temperature electrical conductivity eight to eleven orders of magnitude less than metals are called _________.
Fill in the blank(s) with the appropriate word(s).
A dictator has built a bunker for his use in emergencies. Its dimensions are shown below. When it floods to ground level during a tropical storm, the gauge pressure at point A, in Pa, is
A. 3.92 × 105. B. 4.90 × 105. C. 5.39 × 105. D. 5.88 × 105. E. 6.89 × 105.
Where in the "Tree of Life" will current organisms be located that are most closely related to the common ancestor of all life on Earth?
A) at the branch between animals and plants B) very close to the root C) at the branch between Archaea and Eukarya D) very far from the root
During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
A) to increase the force exerted on the bullet due to the expanding gases from the gunpowder B) to reduce the force exerted on the bullet due to the expanding gases from the gunpowder C) to reduce frictional losses D) to exert a larger force on the shells E) to allow the force of the expanding gases from the gunpowder to act for a longer time