4. An extruded bar of aluminum alloy has the cross section shown in Fig. 4. A 1-meter length of this bar is used as a cantilever beam. A concentrated load P = 1.25 kN is applied at the free end and makes an angle of a = 10 degree with the y-axis passing through the centroid. The view in Fig. 3 is from the free end toward the fixed end of the beam. a) Determine the orientation of the neutral axis. What locations potentially have maximum stress? b) Determine the maximum tensile and compressive stresses in the beam. Note: Neglect torsional effect. (Ans I₂ = 184,333 mm, I, 189,333 mm, Izy = 66,000 mm, 0,max = 180 MPa and oc,max = 145.5 MPa) P y I 1 m P X Z 10 mm- 40 mm Fig. 4 y 30 mm 2 (0,0) α 50 mm 10 mm + Ţi 10 mm

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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.