We plan on using thermal evaporation chamber to grow a metal alloy (thin film) with Cu 2.0 wt% (weight percent) and Al 98.0 wt%. Source temperature is controlled at 1350K. Please estimate what the target concentrations (weight percent) are in order to maintain the right alloy composition. (Vapor pressure for Al at 1350K is 10-3 torr, and for Cu at 1350K is 2x10-4 torr. Note that if we change the source temperature for growing this alloy, the target concentration needs an adjustment based on their vapor pressure variations.)

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

Aplate of dimensions 3 m x 3 m is placed 0.37 mm apart from a fixed plate. the plate requires a force of 2n to move at speed of 45 cm/s. evaluate the viscosity of the fluid in between the plates