..ooo AT&T; 12:40 PM @7696. session.masteringphysics.com C Problem 30.48 Masteri

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..ooo AT&T; 12:40 PM @7696. session.masteringphysics.com C Problem 30.48 MasteringPhysics Problem 30.48 The conducting path between the right hand and the left hand can be modeled as a 10-cm-diameter, 180-cm-long cylinder. The average resistivity of the interior of the human body is 4.9 m . Dry skin has a much higher resistivity, but skin resistance can be made negligible by soaking the hands in salt water Part A If skin resistance is neglected, what potential difference between the hands is needed for a lethal shock of 100 mA across the chest? Your result shows that even small potential differences can produce dangerous currents when the skin is wet. Express your answer to two significant figures and include the appropriate units. AV= Value Units Submit Give Up Continue

Explanation / Answer

Resistance between hands, R = rho*L/A (here L is length and A is cross sectional area)

= 4.9*1.8/(pi*0.1^2/4) ( A = pi*d^2/4, where d is diameter )

= 1123 ohms

now Apply Ohm's law

delta_V = I*R

= 1123*100*10^-3

= 112.3 volts <<<<<<--------Answer

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