Determine the lubrication parameters with u=0.03350 pa. s, n =600rpm, 20mm, l=40 the average oil film temperature in oil bath and moving air condition and ambient temperature 30°c, use at least 3 iterations. state whether you should change the oil. what happens if you instead use sae 70 at 80°c with the shaft still rotating at the same n? compare each values of each parameter.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

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