The figure indicates one reason no one should stand under a tree during a lightning storm. If lightning comes down the side of the tree, a portion can jump over to the person, especially if the current on the tree reaches a dry region on the bark and thereafter must travel through air to reach the ground. In the figure, part of the lightning jumps through distance d in air and then travels through the person (who has negligible resistance relative to that of air). The rest of the current travels through air alongside the tree, for a distance h. If d/h = 0.408 and the total current is | = 5180 A, what is the current through the person? Lightning-

The figure indicates one reason no one should stand under a tree during a lightning storm. If lightning comes down the side of the tree, a portion can jump over to the person, especially if the current on the tree reaches a dry region on the bark and thereafter must travel through air to reach the ground. In the figure, part of the lightning jumps through distance d in air and then travels through the person (who has negligible resistance relative to that of air). The rest of the current travels through air alongside the tree, for a distance h. If d/h = 0.408 and the total current is | = 5180 A, what is the current through the person? Lightning-

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter18: Direct-Current Circuits

Section: Chapter Questions

Problem 18P: (a) Find the current in each resistor of Figure P18.18 by using the rules for resistors in series...

See similar textbooks

Similar questions

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
(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
Could a person on intravenous infusion (an IV) be microshock sensitive?
(a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00×102 MV, and a length of 1.00 ms?(b) What mass of tree sap could be raised from 18.0ºC to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?
The human body can exhibit a wide range of resistancesto current depending on the path of the current, contactarea, and sweatiness of the skin. Suppose the resistance acrossthe chest from the left hand to the right hand is 1.0 x 106 Ω.(a) How much voltage is required to cause possible heartfibrillation in a man, which corresponds to 500 mA of directcurrent? (b) Why should rubber - soled shoes and rubbergloves be worn when working around electricity?
A person with body resistance between his hands of 10.0 kΩ accidentally grasps the terminals of a 20.0-kV power supply. (Do NOT do this!) What is the power dissipated in his body?
For the cirouit shown in the figure, the switch Sis initisly open and the capacitor voltage is 78 V. The switch is then dlosed at time =0. Aher closing the switch, what is the time (in s) wil the current in the resistor be 5 22 uF 2.8 MO El- ww
A typical lightning strike during athunderstorm can carry 400 kA and havea potential difference of 1.1 GV. How muchpower does it generate? The SI prefix giga- (G)is equal to 109.
A car battery does 360 J of work on the chargepassing through it as it starts an engine. (a) If the emf of the battery is 12 V, how much charge passes through the battery duringthe start? (b) If the emf is doubled to 24 V while the work remainsthe same, does the amount of charge passing through the batteryincrease or decrease? By what factor?
Suppose you leave your car lights on while at a movie. When you return, your battery is too “weak” to start your car. A friend gives you a jump-start with his battery and battery cables. What physics is occurring here?