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Explain the types of polymorphism
In terms of thermodynamics, there are two kinds of polymorphism. For a monotropic system, a plot of the free energy of the various polymorphs against temperature do not cross before all polymorphs melt--in other words, any transition from one polymorph to another will be irreversible. For an enantiotropy system, a plot of the free energy against temperature shows a crossing point before the various melting points, and it might be possible to convert reversibly among the two polymorphs on heating and cooling.
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The weightless simply supported beam below has a VDL of P61kN/m, a point load of P62 kN and a UDL of P63 kN/m as shown. Determine the vertical reaction force at A the maximum bend
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