Strains are measured on the surface of a brass alloy part as follows: εxx = 1600 10−6, εyy = 1300 10−6, and γxy = 1500 10−6×××estimate the in-plane stresses σxx, σyy, and τxy, and also the strain εzz normal to the surface. (assume that the gages were bonded to the metal when there was no load on the part, that there is no yielding, and that no loading is applied directly to the surface, i. e., σzz= τyz= τzx= 0).

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

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.

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet