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A rock always weighs something unless in free fall. If you are asking why that rock doesn't sink in Mercury, its because rock density is 2-3 while mercury is 7.6. The object with higher density will sink. In the case of water, a rock is more dense than water(having a density of 1) and sinks in water.

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βˆ™ 14y ago
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βˆ™ 5mo ago

This is because the gravitational pull on Mercury is weaker compared to Earth due to its smaller mass. Therefore, objects weigh less on Mercury compared to Earth.

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Q: Why does a rock weigh nothing in mercury a metal?
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