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A thermos bottle in the shape of a cylinder has an inner radius of 4.0 cm,...

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Physics

A thermos bottle in the shape of a cylinder has an inner radiusof 4.0 cm, an outer radius of 4.5 cm, and a lengt of 30cm. Theinsulating walls have a thermal conductivity equal to 2.0 x 10^-5cal/(sec-cm celsius). One liter of hot coffee at 90 degrees Celsiusis poured into the bottle. If the outside wall remains at 20degrees Celsius, how long does it take for the coffee to cool to 50degrees Celsius?

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