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
Ans: A. in the zodiac (near the ecliptic)
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Besides Earth, which of the terrestrial planets and/or their satellites show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
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How long between the evolution of single versus multicellular organisms?
A) 4.5 billion years B) 2.5 billion years C) one billion years D) 600 million years E) 63 million years
When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road. If the power developed in an engine is 50.0 hp, what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W.
What will be an ideal response?
A boxcar is equipped with a red laser at the back of the car and a blue laser at the front of the car. When the boxcar is traveling with speed v, the two lasers send out pulses simultaneously. An observer on the ground sees
A. the two pulses hitting the opposite walls at the same time. B. the red pulse hitting the front before the blue pulse hits the back. C. the blue pulse hitting the back before the red pulse hits the front.