The deep submersible vehicle ALVIN has a hollow titanium (SG=4.50) spherical passenger compartment with an inside diameter of 78.08 in and a wall thickness of 1.93 in. (a) Would the empty sphere float in seawater? (b)Would it float if it contained 1000 lbm of people and equipment inside? (c) What wall thickness would cause the empty sphere to be neutrally buoyant?