A transistor in a stereo amplifier dissipates 0.25 W within a cylindrical housing that has a radius of 8 mm and height of 8 mm. The top and sides are exposed to room air at 20 oC with a convection heat transfer coefficient h = 40 W/m2.K. Neglect the bottom. Find the transistor surface temperature

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.