Question

A ball of Styrofoam (ρ = 100 kg/m3) is totally submerged in water. The ball has a mass of 300.0 g (it could be a pretty big block).

What is the volume of the ball?

If a string holds the ball when it’s in the water, what’s the tension in the string?
mass=density*volume
.3kg=100kg/m^3 * V

solve for volume

volume=.3/100 m^3=.003 m^3

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