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Class 5AT - ENGR 111 Week 3 ~ Monday Class 5 T Pollock Fall...

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1 ENGR 111 Week 3 ~ Monday Class 5 T. Pollock Fall, 2009
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2 Rat 5-1 Prepare your engineering paper
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3 Rat 5-1: 20 min 1. Find all of the interior angles and lengths of the sides of the truss. 2. Draw the FBD of the truss. 3. Determine the reactions at the supports.
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4 α β γ Rat 5-1: My answer 2.174 (2.174) γ = 65.3 o α = 180 o – 38.7 o 65.3 o α = 76.0 o CORRECTED
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5 α β γ Rat 5-1: My answer (2)
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6 α β γ Rat 5-1: My answer (3) Sum horizontal forces: (or 3660 lbf) Sum moments about a point. (I chose B.)
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7 Review of Weeks 1 & 2 • Sketching • Page Layout & Calculation Presentation • Trusses • Simple Triangular Shapes • Geometry • Trigonometry • Vectors & Vector Sums • Free Body Diagrams These are tools which we will use in design .
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8 What we haven’t talked about: How to: • use what we have learned to design a truss, • calculate loads in each member of the truss, • document our progress towards a successful design.
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9 • the creative application of scientific principles • to design or develop structures, machines, apparatus, or
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