2.19 The rigid bar ABC is supported by a pin at A and a steel rod at B. Determine the largest vertical load P that can be applied at C if the stress in the steel rod is limited to 35 ksi and the vertical movement of end C must not exceed 0.12 in. Ne- glect the weights of the members. L=4 ft A= 0.5 in.2 E= 29 x10 psi B 2 ft- 3 ft FIG P2 19

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.