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.
a
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Where is it low tide?
A) point 1 only B) point 2 only C) points 1 and 3 D) points 2 and 4
The aberration of starlight gives proof that Earth is
a. rotating. b. revolving. c. precessing. d. none of these.
A 777 aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is 445,000 N, what is the speed of the airplane 10.0 s later?
A) 10.0 m/s B) 12.2 m/s C) 14.0 m/s D) 18.0 m/s E) 20.0 m/s
The moderate temperatures of islands throughout the world has mainly to do with water's
A) poor conductivity. B) vast supply of thermal energy. C) high specific heat capacity. D) high evaporation rate. E) absorption of solar energy.