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I'm having a hard time understanding quite a few problems in chapter 9. I hope someone can help me. 9.8. why was drag force calculated from the south end? I am still having a hard time drawing drag force diagram. Can someone show me what the diagram for the two North-South wall look like...

Anyone interested in studying with me at Alhambra library? I'm taking the whole October off to study for seismic and surveying. I've gone through the whole book of Mansour's surveying problems and some of Hiner's seismic. Let me know if anyone's interested. I can meet you almost any time any day.

Hello, The solution for problem 15 stated that both N-S direction and E-W directions are CASE 3. I don't understand why they are both CASE 3. Shouldn't one is CASE 1 and the other direction would be CASE 3? I apologize if this is a stupid question... Thank you very much in advance!