SITUATION: In accordance with Boussinesq theory, the vertical stress at a point below the center of flexible circular area in a semi-infinite homogeneous isotropic soil mass due to uniform load is given by the expression: P = q(1 -) | Where N= (1+(R/z)?)32 R = radius of circular area z = depth of interest at which stress is induced q = intensity of pressure on the circular area (load per unit area at the base of the footing) %3D %3D %3! Evaluate the vertical stress, in kPa, below the center of the footing at a depth equal to its diameter. 55.85 45.27 72.77 60.69

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Alloys

An alloy is an admixture of two or more metals or a metal and a non-metal. Since ancient times, man has been using alloys. Alloying helps to retain the properties of the parent matter, such as hardness, strength, toughness, ductility and is corrosion-resistant. Copper alloys such as brass have antimicrobial properties that help to fight against (Coronavirus disease 2019) COVID-19 and other hospital-acquired infections. Some common alloys are brass, bronze, solder steel, etc. Most alloys have a lower melting point than their constituents. This is due to the presence of a nonmetal as one of the constituents that behaves as an impurity and restricts the raise of melting point.