# Physics

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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!

• Physics -

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

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