7075-T6 Al has a tensile yield strength of σY=450 MPa. A circular tube of 7075-T6 Al supports an axial load of 60 kN in tension and a torque of 1.0 kN-m. The average diameter of the tube is 50.0 mm. Use the von Mises yield criterion.(a)What is the safety factor against yielding if the wall thickness is 2.0 mm? (1.5)(b)What value of thickness with the same diameter would provide a safety factor of 2.0 against yielding? (2.6 mm)

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.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79