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## Homework Statement

In air, Bob's weight is 687 N. In water, it is 34.7 N.

Determine Bob's average density.

## Homework Equations

## 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.