PROB. 21 22. A beam made up of two unequal leg angles is subjected to a bending moment M having its vector at an angle i (a) For the position shown in the figure, determine the orientation of the neutral axis and calculate the to the z axis (see figure part a). 30° and M = maximum tensile stress o, and maximum compressive stress o, in the beam. Assume that 0=: (b) The two angles are now inverted and attached back-to-back to form a lintel beam which supports two courses of brick façade (see figure part b). Find the new orientation of the neutral axis and calculate the maximum tensile stress o, and maximum compressive stress o, in the beam using 0 = 30° and M= 3.5 kN-m. 3.5 kN m. L 120 X 80 X 12 M 19 mm (a) Lintel beam supporting L 120 X 80 X 12 brick facade M (b)

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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.