Consider air in an truck tire maintained at a pressure of 220 kPa (gage). The atmospheric pressure is 94 kPa. The air in the tire is at a temperature of 25 oC. A 4 mm diameter hole develops in the tire wall, due to a puncture. Approximating the flow out of the hole as isentropic, determine the initial mass flow rate of air leaving the tire [kg/sec].

On a average work day more than work place firs are reorted

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

What are the major differences between injection molding and extrusion?