15.2 Example 2

An electric heater of 1500 Watts is placed in 10 kilograms of water (specific heat 4187 J/kg*K) with an initial temperature of 24 C. What will be the final temperature of the water in Celsius, after 8 minutes (assuming that all the heat generated by the heater is absorbed by water)?

Solution with FisicaLab

Select the Thermodynamics group and, inside this, the Calorimetry and gases module. Erase the content of the chalkboard. And add one element Liquid, one element Applied heat flow and one element Laboratory clock. As show the image below:

To the element Liquid, the 10 kg of water, we have:

Name

0

m

10

c

4187

Ti

24 @ C

Tf

tf @ C

Now to the element Applied heat flow:

dQ/dt

1500

And to the element Laboratory clock:

t

8 @ min

Now click in the icon Solve to get the answer:

tf = 41.196 C ;
Status = success.