Q-4 This problem illustrates that the factor of safety for a machine element depends on the particular point selected for analysis. This bar is made of AISI 1050 cold-drawn steel and is loaded by the forces F= 0.55 kN, P = 4.0 kN, and T= 25 N-m. Determine factors of safety, based upon the distortion energy theory, for stress elements at A and B of the member shown in the figure below. [Draw the necessary planar sress elements for A and B.] y | = 150 mm A

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.