The greatest inaccuracy in Copernicus' model of the solar system was that the planets
a. travel in circular orbits with uniform motion.
b. traveled on epicycles whose centers followed orbits around the Sun.
c. traveled in elliptical orbits.
d. were allowed to travel backwards in their orbits.
e. the planets orbited the Sun.
A
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What temperature has the Big Bang has cooled to by now?
A) About 3,000 K B) 5,800 K C) About 300 K D) Just over 2.7K E) 1.4 K
The curved section of a speedway is a circular arc having a radius of 190 m. This curve is properly banked for racecars moving at 34 m/s. At what angle with the horizontal is the curved part of the speedway banked?
A) 34° B) 30° C) 28° D) 32° E) 26°
Semiconductors: When a voltage is applied across a p-type semiconductor, the holes
A. are destroyed. B. move toward the positive electrode. C. move toward the negative electrode. D. do not move.
The long, heavy tail of a spider monkey enables the monkey to easily vary its
A) weight. B) momentum. C) inertia. D) center of gravity. E) none of the above