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<p>i need help with these questions can you please prove some explanation thank

you...................1.Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2 MΩ measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.5 cm and is 0.2 mm thick. What is the ratio of the resistivity of the leaf tissue to the resistivity of muscle tissue in the human body?....................,..,,, 2. A 30 cm length of an unknown material has resistance 0.01 Ω between its two endpoints. The material has circular cross section with diameter 2 mm. What is the ratio of the resistivity of this material to the resistivity of iron?........................... 3. A 1 m length of an unknown material has resistance 0.25 Ω between its two endpoints. The material has square cross section with side length 3 mm. What is the ratio of the resistivity of this material to the resistivity of human blood?........................4. Variations 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 cm apart. What is the blood resistivity if a 9 V potential difference causes a 230 μA current through the blood in the vein?..........................5. Variations 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 0.5 mm diameter vein at two points 10 cm apart. What is the blood resistivity if a 9 V potential difference causes a 20 μA current through the blood in the vein?......................6. Variations 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 2 mm diameter vein at two points 3 cm apart. What is the blood resistivity if a 4.5 V potential difference causes a 100 μA current through the blood in the vein?...........,,....,.,,.,,........ 7. The total charge a household battery can supply is given in units of mA hr. For example, a certain 1.5 V battery is rated at 900 mA hr. Roughly what is the ratio of the energy this battery is capable of supplying to the energy in a Snickers bar?.............,,,,,,,,.............8. The total charge a household battery can supply is given in units of mA hr. A certain 4.5 V battery is rated at 1200 mA hr. Roughly what is the ratio of the energy this battery is capable of supplying to the energy in a Chipotle burrito?..............................9. The total charge a household battery can supply is given in units of mA hr. For example, a certain 9 V battery is rated at 600 mA hr. Roughly what is the ratio of the energy this battery is capable of supplying to the daily energy consumption of an average American?........................ resistivity constants are Copper(1.7x10^-8), iron(9.7x10^-8), blood(1.6), fat(25), water (2.4x10^5)...................thank you!!! </p>

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