EBK INTRODUCTION TO SUSTAINABLE CIVIL E
1st Edition
ISBN: 9780134037318
Author: Neumann
Publisher: YUZU
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Chapter 3, Problem 13EDDS
To determine
Find the meaning of stationarity with respect to design of water supply and waste water management system. Explain how its presence or absence affects the design and technical performance of these systems.
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2-7 The force P applied at joint D of the square frame causes the frame to sway and form the dashed rhombus. Determine the average normal strain developed in wire AC. Assume the three rods are rigid. I understand how you calculate length LAC its just the sqrt(400^2+400^2) = 565.685mm. I do understand that you have to take LAC'-LAC/LAC to get .0258mm/mm. I'm just not understanding the cosine law used to calculate LAC'. I guess what I'm asking is why do you use cos instead of sin or tangent? I've been trying to understand why that was used for a bit now and it's probably something simple I'm forgetting. If you can, please clarify it in detail. Thank you so much!
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EBK INTRODUCTION TO SUSTAINABLE CIVIL E
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