1.A boat weighing 20,000 metric tons floats. For ease of computation, assume it has a rectangular shape: 295 m long by 40 m wide by 75 m tall. How much of the 75' height is above the water line?
2.Describe how an embedded rebar in concrete can become corroded. If you had a steel rebar of 500MPa strength (manufacturer specified) which lost 20% of its effective cross sectional area due to corrosion, what strength would you estimate remains in this rebar after corrosion?