A typical pacemaker delivers 60 electrically stimulating pulses per minute to a heart, where each 3.5 volt pulse lasts 0.4 milliseconds. The resistance of the heart tissue between the pacemaker electrodes is typically about 600 ohms. If the pacemaker's battery pack stores about 18 kilojoules of chemical energy (the equivalent of about 2 AA batteries) and converts its energy to electrical energy in the heart tissue with an efficiency of 35%, about how long will the battery pack last? (Hint: the answer is 24 years)

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