Q5. The floating platform shown is supported at each corner by a hollow sealed cylinder 1 m, in diameter.The platform itself weighs 30 kN in air, and each cylinder weighs

1.0 kN per meter of length. What total cylinder length L is required for the platform to float 1 m above the water surface ? Assume that the specific weight of the water (brackish) is 10, 000 N/m³. The platform is square in plan view.