In the Pratt truss below the reactions are given: a) State why the forces in AF, EK, FG, JK and HC must be zero. b) Calculate the reactions at A and E c) Calculate the member forces AG and AB using method of joints and state whether the member is in tension or compression d) Calculate the member forces, GH and BC using method of sections and state whether the member is in tension or compression 4 kN 2 kN F 5.000 m G 5.000 m H 5.000 m K 5.000 m 7.071 m 7.071 m 5.000 m 5.000 m 5.000 m 5.000 m B E D 5.000 m 5.000 m 5.000 m 7.071 m 5.000 m 7.071 m 5.000 m

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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.