P5. A spar buoy is a buoyant rod weighted to float and protrude vertically as in Fig.P.5. It can be used for measurements or markers. Suppose that the buoy is

maple wood (SG=0.75), 4 in by 3.5in by 15 ft, floating in seawater (SG=1.125). Calculate h in ft if 30 pounds of steel (SG=7.35) is added to the bottom end of the buoy. (Answer:1.277 ft) (Hint: Item 4.1)