Determine the net energy transfer from a person's body during a 2 minute walk from their office building to their car assuming the following: The outside temperature is 78oF; the student's skin is 91.4oF; Skin emissivity is 0.90, and the surface area of the student is 1.40 m2.

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.