Question For the laser-cut plate shown as the shaded area shown in the first diagram below, calculate the Moment of Inertia about the x-axis. Given: a = 30 mm, b = 35 mm, r = 30 mm For the solution of this problem, the plate may be considered to be a composite shape made of the positive area of the rectangle (1) and negative areas of the quarter circle (2) and triangle (3) as shown (2) (1) (3) a. Enter the Moment of Inertia of the quarter circle (2) about its own centroidal x-axis, I: b. Enter the Moment of Inertia of the quarter circle (2) about the x-axis, Ix:

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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.