Assume that the tile vectors for tiles on the shaded surface shown below point toward us. What is the sign of the current i that flows through this surface?
A. The signed current i is positive.
B. The signed current i is negative.
C. The signed current i is zero.
D. One cannot determine i’s sign from what is given.
A. The signed current i is positive.
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Which of these stars would be the hottest?
A) B0 B) A0 C) M10 D) G2 E) K9
How did Galileo know that the planets go around the sun rather than around Earth?
A) From telescopic observations of the phases of Venus as it moves around the sun. B) From telescopic measurements of the positions of the stars as Earth moved around the sun during the course of one year. C) From the writings of Aristarchus, the ancient Greek astronomer. D) By noting that Venus always lies near the sun, as seen from Earth, from which he concluded that Venus must be orbiting the sun. E) From measurements of the tides raised by the moon as compared with the tides raised by the sun.
Household 120-V outlets are made to accept three-pronged plugs. One of the prongs attaches to the "live" wire at 120 V, and another attaches to the "neutral" wire that is connected to ground. What is the round third prong for?
a. It serves as a backup to the hot wire. b. Nothing electrical, it is for mechanical sturdiness. c. It connects the case of the appliance directly to ground for safety purposes. d. It lets the appliance run if the neutral wire breaks.
Precipitation exceeds evaporation over the
A) continents. B) polar ice caps. C) oceans. D) equator.