Saturday

December 20, 2014

December 20, 2014

Posted by **Selma** on Saturday, March 13, 2010 at 11:19pm.

- Physics -
**drwls**, Sunday, March 14, 2010 at 8:27amCompare the resistance of the annular pipe with that of the water column of the same length.

Riron = (r,iron)L/[pi(ro^2 - ri^2]

Rwater = (r,water)L/[pi*ri^2]

You will need to look up the resisitivity of iron pipe. It is about 10^-7 Ohm-meters, which is 10^-5 times that of water.

The area ratio

(ro^2 - ri^2/ri^2 = (ro/ri)^^2 -1 = 0.56

R,iron/R,water = 10^-5/0.56, so water will conduct only about 2* 10^-5 of the current

**Answer this Question**

**Related Questions**

Math - A pipe has an outside diameter of 1.25 inches and an inside diameter of 0...

algebra - A pipe manufacturer makes pipes of four different sizes. The diameter ...

algebra - A pipe manufacturer makes pipes of four different sizes. The diameter ...

physics - What is the pressure change in water going from a 3.0- cm-diameter ...

physics - A horizontal pipe 17.00 cm in diameter has a smooth reduction to a ...

physics - A horizontal pipe 17.00 cm in diameter has a smooth reduction to a ...

Physics - A horizontal pipe, 10 cm in diameter, has a smooth reduction to a pipe...

Physics - Water flows under pressure from one pipe into a second pipe having ...

physics 203 - Water (p=1000kg/m^3) enters a pipe on the ground with an inside ...

Physics - A liquid of density 1.23 × 103 kg/m3 flows steadily through a pipe of ...