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A string made of pure tin has a radius a, length l and mass m. This...

A string made of pure tin has a radius a, length l and mass m. This string is flattened into flat ribbon of thickness D so that the length increases by 50%. By what factor does the resistance of the string change? This string is then stretched until its section is reduced by 50%. By what factor does the resistance of the string change? The properties of the metal do not change during these manipulations.

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