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http://bridge.ecn.purdue.edu/~whalen/ce573/HW.html <>September 24) Several comments on HW #3: Treat Problems 3.5 and 3.6 as one problem. For Problem 4.12, assume the force acts as described in Problem 4.3, and ignore damping. For Problem 19.3, take 8 terms in your Fourier series. The supplementary problem should be posted by Monday, 9/27. <> <>(October 14) Some modifications and suggestions for HW#4: For Problem 4.27, use forcing interpolation to integrate numerically. Take E = 30x10^6 psi as the Young's modulus for steel, and use I = 348 in^4. (Strictly speaking, this value of I is associated with the weak bending axis, rather than the usual strong axis.) Integrate out to t = 0.4 seconds. For Problem 6.6, instead of comparing with Problem 6.2, please solve this problem twice -- once using constant acceleration and once with linear acceleration -- and compare your results. Integrate out to t = 2.5 seconds. For all problems involving numerical integration, please hand in a copy of your calculations (such as the spreadsheet values from my examples) plus a plot of the appropriate response. The supplementary problem should be posted by Monday. <> <>(October 28) Please modify HW#5 as follows:

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