Ch 22 1/2: Question Preview (ID: 1998)

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Which scientist determined the nature of the forces that keep the planets in their orbits
a) Copernicus b) Galileo c) Brahe d) Newton
The force gravity exerts on an object is called
a) mass b) weight c) volume d) density
A measure of the total maount of matter an objecg contains is called
a) density b) volume c) weight d) mass
One Astronomical unit averages about
a) 39 million km b) 210 million km c) 150 million km d) 93 million km
In the Ptolmaic model of the universe
a) Earth was flat b) Earth was much larger than the sun c) the sun was the center of the universe d) Earth was the center of the universe
According to the ancients, the stars travelled around Earth on the transparent, hollow
a) equatorial plane b) ellipse c) solar orb d) celestial sphere
The apparent westward movement of a planet against the backgroind of stars is called
a) retrograde motion b) universal gravitation c) rotation d) revolution
Aristotle concluded that Earth was round because
a) it cast a curved shadow during a lunar eclipse b) it exhibited retrograde motion c) he calculated the Earth\'s circumference d) he sailed around the world
Hipparchus was best known for his
a) calculation of the Earth\'s size b) discovery of Saturn c) observation of the moon d) star catalog
Which of the following was unknow to the ancient Greeks
a) Earth b) Uranus c) Venus d) Mars
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