What is magnetic field reversal?
A. When earth’s magnetic field leaves the South Pole and enter the North Pole
B. When earth’s magnetic field suddenly disappears for short periods of time
C. When earth’s magnetic field leaves the North Pole and enters the South Pole
D. When earth’s magnetic field suddenly runs east/west instead of south/north
Answers: 3
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Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same
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Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?
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Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r
Answers: 1
What is magnetic field reversal?
A. When earth’s magnetic field leaves the South Pole and enter th...
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