a) Using the values of resistance for arm, leg, and trunk provided in Problem, calculate t...

a) Using the values of resistance for arm, leg, and trunk provided in Problem, calculate the power dissipated in the arm, leg, and trunk.

b) The specific heat of water is 4.18 ×103 J/kg°C, so a mass of water M (in kilograms) heated by a power P (in watts) undergoes a rise in temperature at a rate given by

Assuming that the mass of an arm is 4 kg, the mass of a leg is 10 kg, and the mass of a trunk is 25 kg, and that the human body is mostly water, how many seconds does it take the arm, leg, and trunk to rise the 5°C that endangers living tissue?

c) How do the values you computed in (b) compare with the few minutes it takes for oxygen starvation to injure the brain?

Problem

a) Suppose the power company installs some perspective equipment that could provide a 250 V shock to a human being. Is the current that results dangerous enough to warrant posting a warning sign and taking other precautions to prevent such a shock? Assume that if the source is 250 V, the resistance of the arm is 400 Ω, the resistance ol the trunk is 50 Ω, and the resistance of the leg is 200 Ω. Use the model given in Fig. 2.25(b).

b) Find resistor values from Appendix H that could be used to build a circuit whose behavior is the closest to the model described in part (a).

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