b) The motor-pump system shown in Fig. 5.36(a) is modeled as a rigid bar of mass m=50kg and mass moment of inertia A = 100 kg-m. The foundation of the system can be replaced by two springs of stiffness k = 500 N/m k = 200 N/m. and Determine the natural frequencies of the system. C.G. m, Jo Motor, Pump C.G. xt) Base (a) Foundation FIGURE 5.36 Motor-pump system on springs.

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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.