An aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness of . it has been determined that fracture results at a stress of 250 mpa when the maximum (or critical) internal crack length is 2.0 mm. (a) determine the value of for this same component and alloy at a stress level of 325 mpa when the maximum internal crack length is 1.0 mm. (b) under these circumstances will the component fail?

Acarnot refrigerator operates in a room in which the temperature is 21°c and of power when operating. if the food compartment of the refrigerator is consumes 3 kw to be maintained at 2°c, determine (a) the coefficient of performance of the cycle and (b) the rate of heat removal from the food compartment. refrigerator cycle that has a higher coefficient of performance than that of the discussed (e) is it possible to develop a carn ot refrigerator, operating between the same temperature limits? explain