Ptolemy's model of the universe
a. was heliocentric.
b. included elliptical orbits.
c. contained epicycles.
d. was heliocentric, included elliptical orbits, and contained epicycles.
e. None of the other choices are correct.
c
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A tennis ball bounces on the floor three times, and each time it loses 23.0% of its energy due to heating. How high does it bounce after the third time, if we released it 4m from the floor?
A) 180 mm B) 240 cm C) 18 cm D) 180 cm
If the Earth's mass were suddenly made larger but the Moon's mass stayed the same,
a. the Earth would exert a larger force on the Moon. b. the Moon would exert a larger force on the Earth. c. the Earth would exert a larger force on the Moon but the Moon would exert the same force on the Earth as before. d. none of the above
A circular current loop is placed in an external magnetic field. How is the torque related to the radius of the loop?
a. directly proportional to radius squared b. directly proportional to radius c. inversely proportional to radius squared d. inversely proportional to radius
Ten parsecs is about ________
A) 32.6 light-years B) 10 parallax seconds of angle C) 150 million kilometers D) 10,000 seconds