A block of foam plastic has a volume of 25.0 cm^3 and a density of 0.800 g/cm^3. How large a force is required to hold it under water?
F=mg, m=density times volume
The Attempt at a Solution
I first converted 25.0 cm^3 into 2.5 times 10^-5m^3 and .800 g/cm^3 into 800 kg/m^3
Then I used the formula m=density times volume
m=(800 kg/m^3)(2.5 times 10^-5 m^3)
Then I used the formula F=mg and plugged 0.02 kg for the mass and 9.80 m/s^2 as g and multiply them together to get 0.196N but Ik the answer is suppose to be .0490 and Idk what I'm doing wrong can someone help me. Maybe I didn't think about the density of water or something like that