Underwater (density of water is 1000kg/m^3) it takes only 3.1 N of force to live a 13.5 N turtle (it has said to have an apparent weight of 3.1 N) what is the volume of the turtle in cm^3? (3 sig fig)

A vessel going from salt to freshwater sinks 5cm, then after burning 500kn of coal rises 2.5cm. What is the original weight of the vessel? Assume that the cross-sectional area of the vessel near the water surface is constant. Unit wt of seawater=10.10 kN/m^3.

What is the standard sea level density (p) in slugs/ft^3?

A tidal barrage is in the shape of a quarter cylinder of radius r=16m, as shown in the picture above. If the barrage is 13m wide and holds back water of density 1014kg/m³ to its full height, what is the magnitude of the vertical force on the barrage? Assume that the atmospheric pressure is constant. Give your answer in Kilo Newtons to the nearest whole number. Use an acceleration due to gravity of g=9.81m/s²