Which of the following is NOT a tip for practicing a speech?
A) Only practice the speech in your mind.
B) Practice in front of a mirror.
C) Memorize the beginning and end of the speech.
D) Have the practice audience take notes.

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.