Q: Why does a weighted metallic wire and not a nylon wire cut through ice ?
Sol: Due to pressure , the melting point of the ice below the wire is lowered . Heat is conducted through the metallic wire from above to melt the ice below the wire . The wire passes through the water formed which is reconverted to ice after being relieved of the pressure . This is possible only when the wire is a good conductor of heat . Nylon is a bad conductor .