Ptolemy was important in the history of astronomy because he
A) developed a model of the solar system that made sufficiently accurate predictions of planetary positions to remain in use for many centuries.
B) developed the first scientific model of the universe.
C) was the first to create a model of the solar system that placed the Sun rather than the Earth at the center.
D) was the first to believe that all orbits are perfect circles.
A
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Equilibrium: If the sum of the external forces on an object is zero, then the sum of the external torques on it must also be zero.
A. True B. False
A 5,000 kg satellite is orbiting the Earth in a circular path. The height of the satellite above the surface of the Earth is 800 km. The time it takes for the satellite to travel around the Earth is 
A. 0.750 hours. B. 0.950 hours. C. 1.25 hours. D. 1.68 hours. E. 2.01 hours.
What is the unifying theme of all modern biology?
A) zoology B) ecology C) evolution D) biochemistry
The interval from new Moon to first quarter is about a(n)
A) hour. B) day. C) week. D) month. E) year.