​Dwayne's Welding and Fabrication have decided to start a new line of workbenches to sell.​ Dwayne's designers hand him the blueprint detailing the frame of the workbench before the top and shelves are added. The specs call for 1.75​-in.×1.75​-in. square steel tubing for the frame and 0.21875​-in. thick sheet metal for the top and shelves. Dwayne found each workbench needs 579.41​" of steel tubing and 3074.09 square inches of sheet metal. For shipping​ purposes, Dwayne needs to determine the weight of the workbench. The square steel tubing for the frame weighs 0.16 pounds per inch. The sheet metal for the top and shelves weighs 0.028 pounds per square inch. What is the approximate total weight of one​ workbench? What has not been accounted for that may slightly increase the​ weight?

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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.