3) Nerve cells transmit electrical signals through their long tubular axons. These signals propagate due to a sudden rush of Na+ ions, each with a charge of +e (the fundamental charge). Measurements reveal that typically, about 5.6 x 10¹¹ Na+ ions enter each meter of the axon during a time of 10 ms (milliseconds). a) What is the total charge (in C)? b) What is the current during this inflow of charge in the axon?

3) Nerve cells transmit electrical signals through their long tubular axons. These signals propagate due to a sudden rush of Na+ ions, each with a charge of +e (the fundamental charge). Measurements reveal that typically, about 5.6 x 10¹¹ Na+ ions enter each meter of the axon during a time of 10 ms (milliseconds). a) What is the total charge (in C)? b) What is the current during this inflow of charge in the axon?

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Current And Resistance

Section: Chapter Questions

Problem 27.76AP

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Review. When a straight wire is warmed, its resistance is given by R = R0,[1 + a(T T0)] according to Equation 27.20, where a is the temperature coefficient of resistivity. This expression needs to be modified if we include the change in dimensions of the wire due to thermal expansion. For a copper wire of radius 0.100 0 mm and length 2.000 m, find its resistance at 100.0C, including the effects of both thermal expansion and temperature variation of resistivity. Assume the coefficients are known to four significant figures.
Lightbulb A is marked 25.0 W 120. V, and lightbulb B is marked 100. W 120. V. These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120.-V source. (a) Find the resistance of each lightbulb. (b) During what time interval does 1.00 C pass into lightbulb A? (c) Is this charge different upon its exit versus its entry into the lightbulb? Explain. (d) In what time interval does 1.00 J pass into lightbulb A? (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at 0.110 per kWh.
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