College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 20, Problem 92PE
A heart defibrillator passes 10.0 A through a patient’s torso for 5.00 ms in an attempt to restore normal beating. (a) How much charge passed? (b) What voltage was applied if 500 J of energy was dissipated? (c) What was the path's resistance? (d) Find the temperature increase caused in the 8.00 kg of affected tissue.
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A heart defibrillator passes 12 A of current through a patient's torso for 3×10-3 s to restore
normal beating of the heart.
(a) How much charge passed through the patient's body?
(b) What voltage was used if a total energy of 300 J was dissipated by the current?
(c) Estimate the resistance of the electrical path through the person. State any
assumptions made in answering this question.
A heart defibrillator passes 12.4 A through a patient's torso for 5.00 ms in an attempt to restore normal beating.
(a) How much charge passed?
(b) What voltage was applied if 505 J of energy was dissipated?
kV
(c) What was the path's resistance?
(d) Find the temperature increase caused in the 8.00 kg of affected tissue. The specific heat of tissue is 3500 J/(kg · °C).
°C
Each of the six real batteries in the figure has an emf of 18.6 V and a resistance of 3.89 0. (a) What is the current through the (external)
resistance R=3.51 Q? (b) What is the potential difference across each battery? (c) What is the power of each battery? (d) At what rate
does each battery transfer energy to internal thermal energy?
(a) Number
(b) Number
(c) Number
(d) Number
M.
P
rod
Units
A
Units V
Units W
Units W
R
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Chapter 20 Solutions
College Physics
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Ch. 20 - If aluminum and copper wires of the same length...Ch. 20 - Explain why R=R0(1 + a?T) for the temperature...Ch. 20 - Why do incandescent lightbulbs grow dim late in...Ch. 20 - The power dissipated in a resistor is given by P =...Ch. 20 - Give an example of a use of AC power other than in...Ch. 20 - Why do voltage, current, and power go through zero...Ch. 20 - You are riding in a train, gazing into the...Ch. 20 - Using an ohmmeter, a student measures the...Ch. 20 - What are the two major hazards of electricity?Ch. 20 - Why isn’t a short circuit a shock hazard?Ch. 20 - What determines the severity of a shock? 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