3.44 The opening in the bottom of the tank is square and slightly less than 2 ft on each side. The opening is to be plugged with a wooden cube 2 ft on a side.

(a) Determine the weight W that will insure successful plugging of the hole The wood weighs 40 lb ft3.

(b) Determine the upward force that must be exerted on the block to lift it and allow water to drain from the tank.

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Water 5 ft 2 ft 2 ft W P3.44