Which of the following would be true about solar eclipses if the Moon's orbital plane was exactly aligned with the ecliptic plane?
A) Solar eclipses would be rarer.
B) Solar eclipses would occur more often.
C) Solar eclipses would last much longer.
D) Solar eclipses would be both rarer and would last much longer.
E) Solar eclipses would both occur more often and would last much longer.
B) Solar eclipses would occur more often.
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The reason the north pole of a bar magnet free to rotate points north is because
a. the south geographic pole of the earth is the earth's magnetic north pole. b. the south geographic pole of the earth is the earth's magnetic south pole. c. there is a net accumulation of negative magnetic charge at the earth's south geographic pole. d. there is a net accumulation of positive magnetic charge at the earth's north geographic pole. e. the north geographic pole of the earth is the earth's magnetic north pole.
The finite disk shown below has a uniformly distributed positive charge. Which of the arrows in figure E2.12 best indicates the direction of the electric field vector that the plate produces at the points specified? 
At point P1 a small distance above the disk’s center?
A. A B. B C. C D. D E. AA F. BB G. CC H. DD
Typically, what color is the Martian sky during in the morning and evenings?
A) green B) yellow-brown C) red D) blue
Pressure: Calculate the pressure exerted on the ground due to the weight of a 79-kg person standing on one foot. if the bottom of the person's foot is 13 cm wide and 28 cm long.
A. 2.1 × 104 Pa B. 2.2 × 103 Pa C. 4.8 × 104 Pa D. 5.3 × 104 Pa