Which of the following describes a logic bomb?

a rogue piece of code in a system activates on a certain date
a piece of code replaces the boot instructions
the cookie tracker is exploited to note your browsing habits
a piece of code hidden in a spreadsheet

What precautions should you take to prevent injuries when dealing with heavy loads?

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

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.