Question

Styrofoam has a density of 300 kg/m^3. What is the maximum mass that can hang without sinking from a 50 cm diameter styrofoam sphere in water? (Assume the volume of the mass is negligible compared to that of the sphere.) V sphere = r^34/3 pie

Answer 1

You mean (4/3) pi r^3

r = 0.25 meter

V = .0654 meters^2

mass of water displaced-mass of foam
= (1000-300)(.0654)
= 45.8 kg

Answer 2

Calculate the density of sphere whose mass 20g and its diameter 14cm