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Buoyant Force in Equilibrium of Submerged Block

A block of plastic whose mass is 25 kg and whose density is 850 kg/m^3 is tied by a corfd to the bottom of a pool of seawater whose density is 1025 kg/m^3.
Find the force in the cord.

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Physics statements:
A. There are three forces on the submerged object; the downward weight of the block, M g, the downward force C, exerted by the cord, and the buoyant force upward.
B. The buoyant force, BF, on an ...