1.Under what situation shall engineers use jacking at one end only and from both ends in prestressing work.
2.Determine the magnitude Fs of the tensile spring force in order that the resultant of Fs and F is a vertical force . Determine the magnitude R of this vertical resultant force.
3.Water is transferred at a rate of 2.1cfs from an upper reservoir to a lower reservoir by a concrete pipe 3000ft long. The difference in water level is 60ft. Determine the size of pipe for a water temperature of 60 degrees Fahrenheit. Apply The Darcy-Weisbach equation.