Olbers's paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question?
A) Why is the sky dark at night?
B) What would it be like to ride on a beam of light?
C) How many stars are in the universe?
D) Can we measure the position and momentum of an electron at the same time?
A) Why is the sky dark at night?
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A projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30.0 degrees above the horizontal. What is the range of the projectile?
A. 92.0 m B. 105 m C. 134 m D. 179m E. 205 m
Give an estimate of the number of steps in the stairway of a ten-story building.
A. 101 B. 102 C. 103 D. 104
A 25.0-mH inductor, a 2.00-?F capacitor, and a certain resistor are connected in series across an ac voltage source at 1000 Hz. If the impedance of this circuit is 200 ?, what is the resistance of the resistor?
A) 100 ? B) 184 ? C) 200 ? D) 552 ? E) 579 ?
An odor, such as the odor of bread, is due to
A) individual atoms that detach from the source and diffuse individually through the air. B) an electromagnetic wave emitted by the source [the bread]. C) cosmic vibrations emanating from the Great Pumpkin. D) a pressure wave, similar to a sound wave, emitted by the violets. E) molecules that detach from the source and diffuse through the air.