All categories - 24 February 2007

Specific Heat Capacity and Thermal Conductivity

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1. The problem statement, all variables and given/known data

A pond of water at 0°C is covered with a layer of ice 4.50 cm thick. If the air temperature stays constant at -11.0°C, how much time does it take for the thickness of the ice to increase to 9.00 cm?

____________hours

Hint: To solve this problem, use the heat conduction equation,

dQ/dt = kA T/x

and note that the incremental energy dQ extracted from the water through the thickness x is the amount required to freeze a thickness dx of ice. That is, dQ = LA dx, where is the density of the ice, A is the area, and L is the latent heat of fusion. (The specific gravity and thermal conductivity for ice are, respectively, 0.917 is 2.0 W/m/°C.)



2. Relevant equations

Heat conduction equation

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leave the home during holidays
go the mall without parent(s)
watch tv shows/ movies that are over PG
go to a friends house who they dont know

by the way, im a good person, i do pretty well in school while doing sports full year around

whats the best advice 4 me?

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