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suzukits
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Homework Statement
A solid cube of foam plastic has a volume of 25m^3 and a density of 800kg/m^3. How large a force is required to hold it under water?
Homework Equations
P = F/A
Fb = ρgV
ρ = m/V
The Attempt at a Solution
ρ = m/V
800 = m / 0.000025
m = 0.02kg
so F = mg = 0.02 x 9.8 = 0.196
I understand that the force required to keep it under water will be greater than this but I'm having a hard time finding the right equation.