water flows in a circular duct. At one seection the diametere is 0.3 m, the static pressure is 269 kPa (gage), the velocity is 3 m/s, and the elevation is 10 m above ground leve. At a section downstream at grount level, the duct diameter is 0.15 m. Find the gage pressure at the downstream section if frictional effects may be neglected

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.