An ordinary gold wedding ring is tossed end over end into a running MRI machine with a 4.0 T field. The ring spends 1.2 s in the field, during which it completes 60 full rotations. If the ring has a resistance of 6.0 2 and a diameter of 19 mm, what is the average power Pavg dissipated by the ring? Pavg TOOLS x10 W

An ordinary gold wedding ring is tossed end over end into a running MRI machine with a 4.0 T field. The ring spends 1.2 s in the field, during which it completes 60 full rotations. If the ring has a resistance of 6.0 2 and a diameter of 19 mm, what is the average power Pavg dissipated by the ring? Pavg TOOLS x10 W

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 22P: The human body can exhibit a wide range of resistances to current depending on the path of the...

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Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?
Figure P18.37 shows a simplified model of a cardiac defibrillator, a device used to patients in ventricular fibrillation. When the switch S is toggled to the left, the capacitor C charges through the resistor R .When the switch is toggled to the right, the capacitor discharges current through the patients torso, modeled as the resistor Rtorso, allowing the hearts normal rhythm to be reestablished. (a) If the capacitor is initially uncharged with C = 8.00 F and = 1250 V, find the value of R required to charge the capacitor to a voltage of 775 V in 1.50 s. (b) If the capacitor is then discharged across the patients torso with, Rtorso = 1250 , calculate the voltage across the capacitor after 5.00 ms. Figure P18.37
The human body can exhibit a wide range of resistances to current depending on the path of the current, contact area, and sweatiness of the skin. Suppose the resistance across the chest from the left hand to the right hand is 1.0 106 . (a) How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 500 mA of direct current? (b) Why should rubber-soled shoes and rubber gloves be worn when working around electricity?
Figure P18.37 shows a simplified model of a cardiac defibrillator, a device used to patients in ventricular fibrillation. When the switch S is toggled to the left, the capacitor C charges through the resistor R .When the switch is toggled to the right, the capacitor discharges current through the patients torso, modeled as the resistor Rtorso, allowing the hearts normal rhythm to be reestablished. (a) If the capacitor is initially uncharged with C = 8.00 F and = 1250 V, find the value of R required to charge the capacitor to a voltage of 775 V in 1.50 s. (b) If the capacitor is then discharged across the patients torso with, Rtorso = 1250 , calculate the voltage across the capacitor after 5.00 ms. Figure P18.37
(a) Find the current in each resistor of Figure P18.18 by using the rules for resistors in series and parallel. (b) Write three independent equations for the three currents using Kirchhoffs laws: one with the node rule; a second using the loop rule through the battery, the 6.0- resistor, and the 24.0- resistor; and the third using the loop rule through the 12.0- and 24.0- resistors. Solve to check the answers found in part (a). Figure Pl8.18
(a) Find the current in each resistor of Figure P18.18 by using the rules for resistors in series and parallel. (b) Write three independent equations for the three currents using Kirchhoffs laws: one with the node rule; a second using the loop rule through the battery, the 6.0- resistor, and the 24.0- resistor; and the third using the loop rule through the 12.0- and 24.0- resistors. Solve to check the answers found in part (a). Figure Pl8.18
(a) What is the average power output of a heart defibrillator that dissipates 400 J of energy in 10.0 ms? (b) Considering the high-power output, why doesn’t the defibrillator produce serious bums?
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The figure below shows a simplified model of a cardiac defibrillator, a device used to resuscitate patients in ventricular fibrillation. S R C Riorso + When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rrso, allowing the heart's normal rhythm to be reestablished. torsc HINT (a) If the capacitor is initially uncharged with C = 7.25 µF and E = 1260 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 785 V in 1.20 s. Ω Rtorso (b) If the capacitor is then discharged across the patient's torso with R, 1260 0, calculate the voltage (in V) across the capacitor after 4.50 ms. V
"Thermal energy" situations exist everyday in our homes, but we don't call them "thermal energy" applications. We call them baking, cooking, or turning up the house heater. Let's look at a small hair dryer that draws 10A of current under a typical household 120V voltage. What is the power rating of the hair dryer in watts? Depending on the application, the time unit of minutes or hours are preferred over the time unit of seconds often used in physics. Utility companies use kilowatt-hour units for energy rather than the watt-second units. These units are more practical given how much energy a home uses. Let's say you run the hair dryer 6 minutes to dry your hair. How much energy was used in Watt-hour units? What is this energy in kilowatt-hours (kWh) ? Electricity is not free. Someone pays the electric utility bill so you can run the hair dryer, heat the home, cook and bake. The average electricity rate in the U.S. is about 10 cents per kilowatt-hour. (By the way, the state of…
The figure below shows a simplified model of a cardiac defibrillator, device used to resuscitate patients in ventricular fibrillation. S R C Rtorso + When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rorsor allowing the heart's normal rhythm to be reestablished. HINT (a) If the capacitor is initially uncharged with C = 7.25 µF and E = 1240 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 765 V in 1.60 s. (b) If the capacitor is then discharged across the patient's torso with Rorso = 123o n, calculate the voltage (in V) across the capacitor after 7.00 ms. V
The figure below shows a simplified model of a cardiac defibrillator, a device used to resuscitate patients in ventricular fibrillation. R C Riorso + When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rorso allowing the heart's normal rhythm to be reestablished. HINT (a) If the capacitor is initially uncharged with C = 8.25 µF and E = 1270 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 795 V in 1.20 s. 3.904*10**-6 (b) If the capacitor is then discharged across the patient's torso with Rorso = 1240 0, calculate the voltage (in V) across the capacitor after 4.50 ms. 512.06 V