Mr. Auric Goldfinger, criminal mastermind, intends to smuggle several tons of gold across international borders by disguising it as lumps of iron ore. He commands his engineer minions to form the gold into little spheres with a diameter of exactly and paint them black. However, his chief engineer points out that customs officials will surely notice the unusual weight of the "iron ore" if the balls are made of solid gold (density ). He suggests forming the gold into hollow balls instead, so that the fake "iron ore" has the same density as real iron ore. Calculate the required thickness of the walls of each hollow lump of "iron ore."
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Mr. Auric Goldfinger, criminal mastermind, intends to smuggle several tons of gold across internatio...
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