A bar magnet is broken in half and the magnetic field around one piece is mapped out. What is wrong with this picture?
A. The field lines are pointing in the wrong direction
B. There is no south pole
C. The field lines should converge on the "N"
D. Nothing; this is how the field looks around a broken magnet
Answer: B
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Indicate whether the statement is true or false
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Indicate whether the statement is true or false
How does the diameter of the disk of the Milky Way Galaxy compare to its thickness?
A) The diameter is about 100 times as great as the thickness. B) The diameter and thickness are roughly equal. C) The diameter is about 10 times as great as the thickness. D) The diameter is about 100,000 times as great as the thickness.
Pluto's bulk density is:
A) 3,400 kg/m3, comparable to our Moon's. B) 2,100 kg/m3, similar to Callisto's mix of rock and ice. C) 1,200 kg/m3, like Mimas, made of almost pure ice. D) 700 kg/m3, like Saturn a mix of hydrogen and helium slush. E) 400 kg/m3, like Comet Halley's nucleus, a ice ball with many gas pockets.