Why did Ptolemy have the planets orbiting Earth on "circles upon circles" in his model of the universe?
A) to properly account for the varying distances of the planets from Earth
B) to explain why Venus goes through phases as seen from Earth
C) to explain why the Greeks were unable to detect stellar parallax
D) to explain the fact that planets sometimes appear to move westward, rather than eastward, relative to the stars in our sky
E) to explain why more distant planets take longer to make a circuit through the constellations of the zodiac
D
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A river's suspended load and bed load may accumulate at its mouth and form a(n)
a. delta. b. flood plain. c. moraine. d. abyssal plain.
If you jump vertically while inside a fast-moving train that is slowing down, you land
A) a bit ahead of your original position. B) at your original position. C) a bit behind your original position.
Explain why California is so prominent in the use of renewable energy sources
What will be an ideal response?
For chlorine gas, the van der Waals constants are: a = 0.658 J?m3/mol2, and b = 5.62 × 10-5 m3/mol. A 3.0-L tank contains 10.0 moles of chlorine gas at a temperature of 625 K. What is the pressure in the container?
A) 14.0 MPa B) 13.5 MPa C) 17.3 MPa D) 11.0 MPa E) 18.2 MPa