6. Find the heat flow in 24 hours through a refrigerator door 30.0” x 58.0” insulated with cellulose fiber 2.0“ thick. The temperature inside the refrigerator is 38°F. Room temperature is 72°F [answer in BTUs]

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

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.

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero