1. The problem statement, all variables and given/known data In air, Bob's weight is 687 N. In water, it is 34.7 N. Determine Bob's average density. 2. Relevant equations 3. The attempt at a solution Is it correct to say that (buoyancy force) + 34.7 N = 687 N? If so then buoyancy force = (density of water)(volume)*9.81 m/s I can solve for the volume. Then I can use (density of Bob)(volume)(9.81 m/s) = 687 N do solve for Bob's average density. Is that right? I just want to make sure it's okay before doing the rest of the problem.