Heat Transfer Review

Heat Transfer Review - Heat Transfer March 20, 2007 Warm-up...

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Heat Transfer March 20, 2007
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Warm-up Wrap a fur coat around a thermometer. Will its temperature rise? Explain why or why not. If you hold one end of a metal nail against a piece of ice, the end in your hand soon becomes cold. Does cold flow from the ice to your hand? Explain.
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Answer No, the thermometer will not heat up because it is the same temperature as the coat. There has to be a difference in temperature in order for heat transfer to take place No, cold does not flow. Heat flows from your hand to the nail to the ice. Since your hand is losing heat, it feels cold. HEAT is the only thing that flows.
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Practice Question Explain why “firewalkers” can walk safely across a bed of red-hot coals in bare feet.
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Answer Because the rate of heat transfer is slow, because coals are not very good conductors. If they walk fast enough, there is only a small amount of heat transferred to their feet, and they do not burn.
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Practice Question If heat transfers from hot to cold, and stops when the two objects reach the same temperature, explain why it is possible for the inside of your car to be hotter than the air outside on a hot summer day.
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This note was uploaded on 11/08/2011 for the course PHYSICS 121 taught by Professor Richardvanfleet during the Winter '09 term at BYU.

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Heat Transfer Review - Heat Transfer March 20, 2007 Warm-up...

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