In the casting of steel under certain mold conditions, the mold constant in chvorinov’s rule is known to be 4.0 min/cm2 , based on previous experience. the casting is a flat plate whose length = 30 cm, width = 10 cm, and thickness = 20 mm. determine how long it will take for the casting to solidify.

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.

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.