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A pail of water is rotated in a vertical circle of radius 1.00 m (the approximate length of a person arm). What must be the minimum speed of the pail at the top of the cirlce if no water is to spillout.
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Question: People have proposed driving motors with the earth's magnetic field. This is possible in principle, but the small field means that unrealistically large currents are needed to produce noticeable torques. Suppos ...
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