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A ping pong ball can be approximated as an air-filled sphere of radius 0.039 m and...

A ping pong ball can be approximated as an air-filled sphere of radius 0.039 m and an average density of 840 kg/m3. The pin-pong ball is held fully submerged in water in a large tank such that it is just under the surface. Calculate the value of the downward force that is required to keep the ball submerged.

[Density of water = 1.00 x 103 kg/m3]

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