E. The conductive tissues of the upper leg can be modeled as a 40-cm-long, 12-cm-diameter cylinder of muscle and fat. The resistivities of muscle and fat are 13 Nm and 25 m, respectively. One person's upper leg is 82% muscle, 18% fat. What current is measured if a 1.5 V potential difference is applied between the person's hip and knee?
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- Flying Circus of Physics Kiting during a storm. The legend that Benjamin Franklin flew a kite as a storm approached is only a legend – he was neither stupid nor suicidal. Suppose a kite string of radius 2.07 mm extends directly upward by 0.809 km and is coated with a 0.514 mm layer of water having resistivity 177 Q-m. If the potential difference between the two ends of the string is 190 MV, what is the current through the water layer? The danger is not this current but the chance that the string draws a lightning strike, which can have a current as large as 500 000 A (way beyond just being lethal). Number i UnitsVariations in the resistivity of blood can give valuable clues to changes in the blood's viscosity and other properties. The resistivity is measured by applying a small potential difference and measuring the current. Suppose a medical device attaches electrodes into a 1.5-mm-diameter vein at two points 5.0 cm apart. What is the blood resistivity if a 8.6 V potential difference causes a 240 μA current through the blood in the vein?The resistance of the body varies from approximately 500 kΩkΩ (when it is very dry) to about 1.0 kΩkΩ (when it is wet). The maximum safe current is about 5.3 mAmA. At 10 mAmA or above, muscle contractions can occur that may be fatal. What is the largest potential difference that a person can safely touch if his body is wet?
- P9 E4Kiting during a storm. The legend that Benjamin Franklin flew a kite as a storm approached is only a legend — he was neither stupid nor suicidal. Suppose a kite string of radius 2.10 mm extends directly upward by 0.802 km and is coated with a 0.520 mm layer of water having resistivity 155 Ω·m. If the potential difference between the two ends of the string is 176 MV, what is the current through the water layer? The danger is not this current but the chance that the string draws a lightning strike, which can have a current as large as 500 000 A (way beyond just being lethal).The figure gives the electric potential V(x) along a copper wire carrying uniform current, from a point of higher potential V, = 8.00 µV at x = 0 to a point of zero potential at x, = 2.60 m. The wire has a radius of 2.10 mm, and copper has a resistivity of 1.69 x 10-8 0-m. What is the current in the wire? V. x (m) Number i Units (A) A
- The electron beam inside an old television picture tube is 0.40 mmmm in diameter and carries a current of 50 μA. This electron beam impinges on the inside of the picture tube screen. What is the current density in the electron beam and how many electrons strike the screen each second? The electrons move with a velocity of 3.0×107m/s. What electric field strength is needed to accelerate electrons from rest to this velocity in a distance of 5.0 mm? Each electron transfers its kinetic energy to the picture tube screen upon impact. What is the power delivered to the screen by the electron beam?A wire has a current density of 7.09 x 10° A/m?. If the cross-sectional area of the wire is 2.11 mm², what current I does the wire carry? A. With this current, how much time t is required for 4.05 x 100 electrons to pass any point on the wire?3. The batteries in FIGURE P27.68 are identical. Both resistors have equal currents. What is the resistance of the resistor on the right? E R FIGURE P27.68 AV bat (V) 1.5 0 0 FIGURE P27.69 2 h