Skills for solving circuit problems
Respiration detector A respiration detector monitors a person’s breathing. One type consists of a flexible hose filled with conductive salt water (resistivity of 5.0 ? . m). Electrodes at the ends of the tube measure the resistance of the fluid in the tube. The tube is wrapped around a person’s chest. When the person inhales and exhales, the tube stretches and contracts and its resistance changes. Determine the factor by which the resistance of the fluid changes when the hose is stretched so that its length increases by a factor of 1.1. The water volume remains constant.
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