An aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness of 35 . It has been determined that fracture results at a stress of 228 MPa when the maximum (or critical) internal crack length is 2.49 mm. a) Determine the value of for this same component and alloy at a stress level of 342 MPa when the maximum internal crack length is 1.25 mm.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.