The opening in the bottom of the tank is square and slightly less than \(2 \mathrm{ft}\) on each side. The opening is to be plugged with a wooden cube \(2 \mathrm{ft}\) on a side.

(a) What weight \(W\) should be attached to the wooden cube to insure successful plugging of the hole? The wood weighs \(40 \mathrm{lb} / \mathrm{ft}^{3}\).

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

Transcribed Image Text:

Water 5 ft 2 ft 2 ft W P3.81