A 5m long ladder leans against a frictionless wall at an angle of 54° as shown below. LeSm Centre of mass -54 (a) From the diagram above write down expressions for the x and y components of translational equilibrium and for rotational equilibrium. The pivot point should be at the base of the ladder.. (b) Using the expressions for translational and rotational equilibrium in (a) what is the minimum value of the coefficient of static friction, us, with the ground that prevents the ladder slipping?

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Chemical and Phase Equilibrium

Phase diagrams or equilibrium phase diagrams are the graphical representations that show the phase transformations of the constituting elements with respect to the pressure, temperature, and compositions. The diagrams show the conditions that limit the different phases, namely solid, liquid, and gas. The diagram can also be utilized to verify the relations between the state variables. Most of the phase diagrams are temperature-pressure phase diagrams, with the variable parameter as the composition. Usually other variables such as solubility and pressure parameters are not indicated in the phase diagram. For a one-component system (unary phase diagram), the phase diagram is generally a function of temperature and pressure as the state variables, or temperature and volume. However, for a binary system (two-phase) having two components, the phase diagram is a function of temperature and composition as the state variables only. Coexisting of the different phases of the constituting elements is indicated in the phase diagram. A ternary phase diagram can be characterized by consisting of three phases in equilibrium.