In an ECM operation the frontal working area of the electrode is 1555 mm2 . Applied current = 1200 amps and voltage = 12 volts. The material being cut is nickel (valence = 2). (a) If the process is 90% efficient, determine the rate of metal removal in mm3 /min. (b) If the electrolyte resistivity = 150 ohm mm, determine the working gap.

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.