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Capacitance of a Capacitor

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In a heart pacemaker, a pulse is delivered to the heart 81 times per minute. The capacitor that controls this pulsing rate discharges through a resistance of 1.8e6 ohms. One pulse is delivered every time the fully charged capacitor loses 62.9 % of its original charge. What is the capacitance of the capacitor? Answer in farads.

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Because the capacitor loses 62.9% of its original charge:
q = ...

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The solution is given as a step-by-step equational process.

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