At approximately what time does the third quarter Moon rise?
a) 9pm
b) 6pm
c) noon
d) 6am
e) midnight
Answer: e) midnight
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Match the moons listed to the left with the characteristics described in the sentences to the right. Drag words from the left to the blanks on the right. Each moon should be used only once.
Lenz's Law: A circular wire ring is situated above a long straight wire, as shown in the figure. The straight wire has a current I flowing to the right, and this current is increasing at a constant rate. Which of the following statements is true?
A. There is an induced current in the wire ring, directed in clockwise orientation. B. There is an induced current in the wire ring, directed in a counterclockwise orientation. C. There is no induced current in the wire ring.
How does Earth's varying distance from the Sun affect our seasons?
A) It doesn't; Earth's orbital distance plays no significant role in the seasons. B) It makes summer warmer in the Northern Hemisphere than in the Southern Hemisphere. C) It is responsible for the fact that the seasons are opposite in the Northern and Southern hemispheres. D) It causes the seasons to be more extreme than they would be if the Earth's distance from the Sun were always the same.
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.