Chp4, Lab-03 Example Problems 4.5.[60,54] Engineering 36 Chp4, Lab-03 Example Problems 4.5.[60,54] From S & T Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege.edu

Problem 4.5.54 200 N Find W|| Find W Find θ Such That

Problem 4.5.60 Write an Expression for F1 Write an Expression for F2 Show That: F1 = – F2

→ 𝜃 𝑥 =68.6° • 𝜃 𝑦 =79.5° • 𝜃 𝑧 =155.9°

MATLAB solution % Bruce Mayer, PE % ENGR36 * 24Aug10 % ENGR36_Lab03_P4_5_60_1008.m % AB = [2 1 -5]; % i j k in meters LAB = sqrt(sum(AB.*AB)); uAB = AB/LAB; F1 = uAB*3 % 3 is in kN BA = [-2 -1 5]; % i j k in meters LBA = sqrt(sum(BA.*BA)); % should be SAME as LAB uBA = BA/LBA; F2 = uBA*3 % 3 is in kN MinusF2 = -F2 % has SAME components as F1, QED