In Copernicus's theory, retrograde planetary motion is explained as
A) a result of Earth's motion: as Earth passes another planet, that planet appears to move backward as seen against the background stars.
B) due to the back-and-forth or "oscillatory" motion that planets make as they move along their circular orbits around Earth.
C) due to the natural wandering of the celestial sphere of background stars.
D) the backward part of the planet's loop-the-loop orbits around Earth.
E) Actually he didn't have an explanation for this.
A
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In the first law of thermodynamics
the variables Q and W stand for
A. the heat flow out of the system and the work done on the system. B. the heat flow out of the system and the work done by the system. C. the heat flow into the system and the work done by the system. D. the heat flow into the system and the work done on the system.
The Sun and the Moon have the same angular size. If the Sun is 400 times farther away from the Moon, the Sun must be ________ times the size of the Moon.
A. 400 B. 1/400 C. 4 D. 1/4 E. 4?
A vertical wire carries a current straight up in a region where the magnetic field vector points due North. What is the direction of the resulting force on this current?
A) North B) downward C) East D) West E) South
Why does the high specific heat of water make it useful as a coolant?
What will be an ideal response?