1) (You must show your work for credit) Note: This is a former FE Exam problem. 3. One leg of a mercury U-tube manometer is con- nected to a pipe containing water under a gage pressure of 100 kPa. The mercury in this leg standa 750 mm be low the water. What is the height of mercury in the other leg, which is open to the air? The specific gravity of mercury is 13.5. 100 kPa water 750 mm mercury (A) 0.2 m (B) 0.5 m (C) 0.8 m (D) 1 m 2) Problem 3.20. 3) Problem 3.47. It will help to define a new coordinate system while determining the resultant force, Fa, and its location. Only Answers required: Give the resultant force, Fa, magnitude Give the resultant force in vector form ( FR = FR? ? + FR? ?) Where in the gate is the resultant force acting? 4) Problem 3.55. As in problem (3), think about how you define your coordinate system - a good coordinate system can save a lot of geometry