The 2-kg block is held in equilibrium by the system of springs. Draw a free-body diagram for the ring at A. 3 m 3 m- KAC wwwww = 20 N/m A 00000000 D KAB = 30 N/m KAD = 40 N/m Solution 1. The ring at A has negligible size so that it can be modelled as a particle. 2. Imagine the ring at A to be separated or detached from the system. 3. The (detached) ring at A is subjected to three external forces. They are caused by: i. ii. iii. 4. Draw the free-body diagram of the (detached) ring showing all these forces labeled with their magnitudes and directions. which will help when formulating the You should also include any other available information e.g. lengths, angles etc. equilibrium equations for the ring.

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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.