In drilling for oil in the Gulf of Mexico, some divers have to work at a depth

Question:

In drilling for oil in the Gulf of Mexico, some divers have to work at a depth of \(1300 \mathrm{ft}\).

(a) Assume that seawater has a constant density of \(64 \mathrm{lb} / \mathrm{ft}^{3}\) and compute the pressure at this depth. The divers breathe a mixture of helium and oxygen stored in cylinders, as shown in Fig. P2.119, at a pressure of 3000 psia.

(b) Calculate the force, which trends to blow the end cap off, that the weld must resist while the diver is using the cylinder at \(1300 \mathrm{ft}\).

(c) After emptying a tank, a diver releases it. Will the tank rise or fall, and what is its initial acceleration?

Figure P2. 119