Solve 4.108, assuming that cable CD forms an angle = 25 with the vertical xy plane. PROBLEM 4.108 A 12-m pole supports a horizontal cable CD and is held by a ball and socket at A and two cables BE and BF. Knowing that the tension in cable CD is 14 kN and assuming that CD is parallel to the x-axis ( = 0), determine the tension in cables BE and BF and the reaction at A.

PY 205 with Daniel Dougherty Week 1 Chapter 1 1/12/2016 Theory – broader, more detailed and can give quantitatively testable predictions, often with great precision Law – certain, concise but general statements about how nature behaves Principle- less general statements o Scientific laws are descriptive because they describe how mature behaves Uncertainty and percent uncertainty o Ratio of uncertainty to the measured value X 100 to make it a percent o Ex: 8.8 +/- .1cm .1/8.8 X 100 = 1% Significant figures o 0 is a placeholder o Ex: 80 one significant figure since 0 does not count o RULE: number of significant figures in the last number should be the s