Physics
posted by Allie on .
A ball has a diameter of 3.70 cm and average density of 0.0841 g/cm3. What force is required to hold it completely submerged under water?
I need to find the magnitude in N
Thank you!

Let the unknown required force be F.
F + M*g = buoyant force
= (volume)*(water density)*g
Volume = (pi/6)*D^3 = 26.52 cm^3
M = Mass = 2.23 g
That is an extremely light ball. More like a balloon.
The buoyancy force is much larger than the weight.
Solve for F