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Consider a hypothetical flat circular (cookie-shaped) animal that lives on the surface of seawater. It's 5% denser than seawater (assume the density of seawater is

Consider a hypothetical flat circular (cookie-shaped) animal that lives on the surface of seawater. It's 5% denser than seawater (assume the density of seawater is 1000 kg/m³), and five millimeters thick. What is the largest diameter it could be and still stay at the surface, using a combination of surface tension and buoyancy?

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