It is desired to produce and aligned carbon fiber-epoxy matrix composite having a longitudinal tensile strength of 640 mpa. calculate (a) the critical fiber length in mm, and (b) the volume fraction of fibers necessary if

(1) the average fiber diameter is 0.029 mm,

(2) the average fiber length is 2.2 mm,

(3) the fiber fracture strength is 5200 mpa,

(4) the fiber-matrix bond strength is 18 mpa,

(5) the matrix stress at fiber failure is 16.1 mpa.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above