The Large Optics Diamond Turning Machine at the Lawrence Livermore National Lab in California can cut a human hair lengthwise 3000 times! That
would produce pieces with a cross-sectional area of 10−7mm2. A 1.0 m long silver wire with this cross-sectional area would have a resistance of 160 kΩ. Consider three pieces of silver wire connected in series. If their lengths are 2.0 m, 3.0 m, and 7.5 m, and the resistance of each wire is proportional to its length, what is the equivalent resistance of the connection?