Acommercial enclosed gear drive consists of a 20o spur pinion having 16 teeth driving a 48 tooth spur gear. the pinion speed is 300 rev/min, the face width 2 in, and the diametral pitch 6 teeth/in. the gears are grade 1 steel, through hardened at 200 brinell, made to no. 6 quality standards, uncrowned and are to be accurately and rigidly mounted. assume a pinion life of 108 cycles and a reliability of 0.90. determine the agma bending and contact stresses and the corresponding factors of safety if 5 hp is to be transmitted.

An air-conditioning system consists of a heating section and an evaporative cooler. air enters the heating section at 10°c and 70 percent relative humidity at a rate of 30m^3/min, and it leaves the evaporative cooler at 20°c and 60 percent relatively humidity. if the air conditioning system operates at a total pressure of 98 kpa, determine (a) the temperature and relative humidity of the air when it leaves the heating section, (b) the rate of heat transfer in the heating section, and (c) the rate of water added to air in the evaporative cooler