and two concentrated loads at point A of 20 kN and of 40 kN at point D as shown in figure 1. Your manger asked you to do the following. A) Replace the distributed load with an equivalent concentrated load. B) Draw a free body diagram for the beam showing the forces acting on the beam and their locations. C) Applying the equations of equilibrium, determine the reactions forces at the fixed pin support B and roller support at point C. D) If the aluminium beam is replaced by another iron beam which undergoes an expansion of 0.2 m when heated from 10 C° to 50 C° (Knowing that the coefficient of linear expansion of iron is a =11.7×10-6 K-1. Calculate the original length of the beam. Then suppose that the temperature is decreased from 50 C° to 10 C°, explain how this will affect the length of the beam? 20 kN 40 kN 45 kN/m ↑ † f f t. 12m Figure 1:Beam

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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.