Question

What is the average density of a woman who floats in freshwater with 3% of her volume above the surface?

Answer 1

$$mg=g\rho_wV_s$$

$$g\rho V=g\rho_wV_s$$

$$\rho=\rho_w\frac{V_s}{V}=1000*0.97=970\:\rm kg/m^3$$