Asolid shaft of diameter 1.5" is loaded in bending with a moment of 5000 lb-in, torsion with a torque of 8000 lb-in and an axial force of 6000 lb. for a 40 ksi yield stress in tension, determine the safety factor using the von mises criteria.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?