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What is the minimum outer diameter of a hollow steel sphere, so that it just begins...

What is the minimum outer diameter of a hollow steel sphere, so that it just begins to sink in
seawater? The density of seawater is 1.025 ×103 kg/m3 and the density of steel is 7.80×103 kg/m3.

Assume that the wall thickness of the hollow sphere is 1.00 cm and that inside the sphere is
completely empty.

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