1.An Offshore drilling rig is being towed out to sea. What is the maximum distance away that the navigation lights can still be seen by an observer standing on the shoreline? the observer's eye height is 5'6", and the uppermost navigation light is 168 ft above the water.
2.What is the resultant force on one side of a 25cm diameter circular plate standing at the bottom of 3m of pool water?
3.The concrete girder supports the two column loads. If the soil pressure under the girder is assumed to be uniform, determine its intensity w and the placement d of the column at B. Draw the shear and moment diagrams for the girder.