Thermal Energy Transfer in a Boiling Water and Aluminum Pan System

[redalertkev]

Homework Statement

140 grams of boiling water (temperature 100° C, heat capacity 4.2 J/gram/K) are poured into an aluminum pan whose mass is 1050 grams and initial temperature 26° C (the heat capacity of aluminum is 0.9 J/gram/K).

(a) After a short time, what is the temperature of the water?

(c) Next you place the pan on a hot electric stove. While the stove is heating the pan, you use a beater to stir the water, doing 24062 J of work, and the temperature of the water and pan increases to 79.7° C. How much energy transfer due to a temperature difference was there from the stove into the system consisting of the water plus the pan?

Homework Equations

The Attempt at a Solution

For (a) I got 54.384

 

[jbsteele]

° C using the equation q = mc(Tf - Ti) where q is the heat transfer, m is the mass of the water, and c is the heat capacity.For (c) I got 24,062 J for the energy transferred from the stove into the system.