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What force is needed to keep a wooden block of density 720 kg and volume 1.0 m3 under water?
Wiki User
∙ 13y ago
Using the rough rule-of-thumb: 1 liter of water = 1 kg.
-- The block sinks until it has displaced 720 liters of water. At that point,
the mass of the displaced water has the same weight as the mass of the
block has, and the block sinks no further.
-- The block still has 280 liters of its volume above water. If that were submerged,
another 280 kg of water would be displaced.
-- The additional 280 kg of water would weigh (280 x 9.8) = 2,744 newtons (617.3 pounds).
That much additional buoyant force would fight the effort to submerge the block.
It takes an additional 2,744 newtons (617.3 pounds) to keep the block under water.
Wiki User
∙ 13y ago
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