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Problem #4: A household iron has a stainless-steel plate that weights 1kg and has a surface area of 0.1m2. The iron is rated at 500W.

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Problem \#4: A household iron has a stainless-steel plate that weights 1kg and has a surface area of 0.1m2. The iron is rated at 500W. If the surroundings are at a temperature of 80F, and the convective heat-transfer coefficient between the plate and surroundings is 3W/m2k, how long will it take for the iron to reach 240F after it is plugged in

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