A Si wafer of diameter D is placed at a height H above a small planar evaporation source. The evaporation flux is proportional to cos q where q is the angle the flux makes with the normal to the plane source. Derive an expression for the ratio of the deposited film thickness at the center of wafer to the deposited film thickness at the edge of the wafer in terms of D and H.

Acompressor receives the shaft work to decrease the pressure of the fluid. 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.

Items are similar to the free issue items, but their access is limited. (clo5) a)-bin stock items free issue b)-bin stock controlled issue c)-critical or insurance spares d)-rebuildable spares e)-consumables