A three-element truss has the configuration shown in Figure 5. A vertical load is applied to the truss at joint B. Each member has a cross-sectional area of 100 mm and all of them are made of aluminum with the Young's modulus E= 70 GPa. Use Castigliano's First Theorem to determine the horizontal and vertical displacements at joint B. The load P= 5 kN and the dimension 1=2 m

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.