) A 2.5 in diameter through hole is to be cut in a block of Copper(1) by electrochemical machining. The block is 2.0 in thick. To speed the cutting process, the electrode tool will have a center hole of 2.25 in, which will produce a center core that can be removed after the tool breaks through. If the efficiency of the ECM operation is 90%, what current is required to complete the cutting operation in X2 minutes?
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