which of the following is true about Copernicus's Model of the cosmos
a) Retrograde motion is an apparent motion which occurs when Earths passes or laps a planet such as Mars as they both orbit the Sun
b) the outer planets orbit the Earth in perfect circles
c)Earth is at the center of the cosmos
a) Retrograde motion is an apparent motion which occurs when Earths passes or laps a planet such as Mars as they both orbit the Sun
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Which of the following statements about planetary nebulas is correct?
A. They expand at a typical rate of 20 kilometers per second. B. They contain flakes of carbon and silicon material. C. Their shape can be very irregular. D. They are shells of glowing gas and dust ejected by dying Sun-like stars. E. All of these choices are correct.
The graph below shows the velocity versus time graph for a ball. Which explanation best fits the motion of the ball as shown by the graph?
A. The ball is falling, is caught, and is thrown down with greater velocity. B. The ball is rolling, stops, and then continues rolling. C. The ball is rising, hits the ceiling, and falls down. D. The ball is falling, hits the floor, and bounces up. E. The ball is rising, is caught, and then is thrown down.
Pressure is
A) proportional to both force and area. B) proportional to force and inversely proportional to area. C) inversely proportional to force and proportional to area. D) inversely proportional to both force and area. E) proportional only to area.
Where on the celestial sphere would you look for the planets?
A. in the zodiac (near the ecliptic) B. on the galactic equator C. at the north celestial pole D. on the celestial equator