5. Fig Q5 shows a shaft of gearbox rotating about x axis. Shalt BC is a solid shalt with circul cross section located between two gears. Two forces F,-3 kN and F,-2 kN are applie on the gears as shown in the figure. These two forces create torsional moments (torque about x axis at B and C due to the respecting gear radi. Consequently the shaft experience torsion between Points B and C. The allowable shear stress of the material is 60MPA. Fc the shaft determine: a) the minimum diameter of the shaft BC. b) the twisting angle of the section B of the shaft relative to the section C. Shear modulus of the shaft is 80 GPa 350 mm D 400 mm C 200 mm 75 mm F=2 kN F, = 3 kN 50 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.