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Golden Romance


Your significant other gave you a watch for Valentine ’s Day, and tells you it’s made of “pure gold” (density of gold = 19,000 kg/m3). Being a mistrusting boy/girl friend, you decide to find out whether this is true. Later that day, you place the watch on a spring scale and lower it into water. The weight on the scale reads 10N out of water and 6N when completely submerged. Is the watch really made out of pure gold?

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Photo attributed to ScientificRelevance.

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