Some fish have a density slightly less than that of water and must exert a force (swim) to stay submerged. What force must an 85.0-kg grouper exert to stay submerged in salt water if its body density is 1015 kg/m3?

Explanation:

Buoyant force is given by the equation:

Given  

We also know that:

Knowing that:

then:

Hence, the 85.0kg needs a to exert a 10N   force to stay submerged.

answer is c

explanation:

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