When in operation, the shaft shown experiences a fully reversible torque. It is machined from a 1040 HR steel, and considering a safety factor of 2, determine the value of the reversible torque that can be applied without causing eventual fatigue failure. Consider for infinite life 106 cycles 2-mm rad. 0.8-mm rad. 24 mm 20 mm 24 mm

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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.