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1. A defibrillator is used to restart a persons heart after it stops beating. Energy is delivered to the heart by discharging a capacitor through the body tissues near the heart. If the capacitance of the defibillator is 9 pF and the energy delivered is to be 300 J, to what potenctial difference must the capacitor be charged?
2. a defibrillator consists of a 15 pF capacitor that is charged to 9.0 kV
(a) if the capacitor is discharged in 2.0 ms, how muc charge passes through the body tissues?
(b) what is the average power delivered to the tissues?
A pendulum is made of a long narrow stainless steel rod and has aperiod of T seconds at -200.0 degrees C. If the temperatureincreases to +400.0 degrees C, what is the new period? (The linearexpansion coefficient of the stainless steel is 1.600×10^-5K..
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