Final answer:
During open-heart surgery, a voltage of 5 volts should be applied to bring a patient out of cardiac arrest.
Step-by-step explanation:
The voltage that should be applied to bring a patient out of cardiac arrest during open-heart surgery can be calculated using Ohm's Law. Ohm's Law states that voltage (V) is equal to current (I) multiplied by resistance (R). In this case, the current needed is 10.0 mA and the resistance is 500 ohms. We can use the equation V = I * R to solve for the voltage:
V = (10.0 mA) * (500 ohms) = 5000 mV = 5 volts
Therefore, a voltage of 5 volts should be applied to bring the patient out of cardiac arrest.