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An object of mass 100 kg is tied to the bottom of a pond with a light chain. If the tension in the chain is 200 N, what is the mass of water displaced by the object ?

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Hmmmm. Does the chain have weight? Ok, a weightless chain.

tension=mg-bouyancy
200=100*9.8-bouyancy

solve for bouyancy, then masswater=bouyancy/9.8N/kg

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