1. The problem statement, all variables and given/known data A 7.56 cm diameter sphere with a mass of 137.1 g is neutrally buoyant in a liquid. What is the density of the liquid? 2. Relevant equations B-mg=0 B=V*density*g 3. The attempt at a solution B=mg V*density*g=mg denisty=M/V denisty= .1371 kg/(4/3*PI*r^2) because its a sphere What am I doing wrong?