Afull day of tourist activities at an amusement park would be expected to a. produce insomnia. b. reduce the amplitude of delta activity in the frontal lobes. c. increase the amount of time spent dreaming. d. increase the amount of time spent that night in slow-wave sleep. e. increase the need for rem sleep.

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.