The force P=10 kips is applied to a bar made of steel F29000ksi, α=22(10-6)1/oF). The bar has cross- sectional areas of 1 in2 in region AB and 4 in2 in region BC. A variation in temperature AT 60°F is applied to the bar. Determine normal stress on a generic section between A and B. Make a 3D drawing showing the normal stress distribution on a generic cross section between A and B.

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

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.

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