He discovered that the orbits of planets are ellipses which was not what was conventionally thought to be true that they orbited in perfect circles
a) Copernicus
b)Tycho Brache
c)Kepler
d)Ptolemy
c)Kepler
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Two flat rings each having outer diameter of 6 inches and inner diameter of 3 inches are parallel and 4 inches apart as shown. Determine the shape factors, F1-2 and F2-1, which are equal.
What is a meteor?
A. the object that causes a "shooting star," but before it passes through the atmosphere B. any one of the large rocky bodies that orbit the Sun, primarily between Jupiter and Saturn C. a space rock that survives its fall through Earth's atmosphere and reaches the ground D. a glowing trail of hot gas and debris heated by friction as an object moves through the atmosphere
Light is refracted as it crosses the interface between two different media because
A. it becomes polarized. B. it changes speed. C. it loses energy. D. it changes frequency.
If you quickly run away from the orchestra at a concert, the frequency of the sound you hear will be
A) decreased. B) increased. C) neither of these.