What is the gravitational potential energy of a 10 kg mass which is 3.4 metres above the ground? note : if using acceleration due to gravity, only use positive 9.81 m/s/s , express your answer as a number rounded to 2 decimal places.

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.