An industrial machine requires a solid, round steel piston connecting rod 1.2 m long that carries a maximum compressive load of 50 kn. the ends are taken to be pinned, e = 210 gpa, and sigma yp= 600 mpa.
(a) using factor of safety of 2, determine the required diameter.
(b) is the diameter you have calculated acceptable? justify your answer by comparing the direct stress based on your calculated diameter and the allowable stress, based on the yield strength of the material.

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.

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length