PDA

View Full Version : Thermal Energy ( Question )


Kenny09
Jan2-08, 11:47 PM
1. The problem statement, all variables and given/known data

A copper cube mass of 110g is heated to a temperature of 100 Celcius degrees and then rapidly transferred to a well insulated aluminium can of mass 80g containing 200g of water at 10 C degrees . If the final temperature of the cube and water ( after stirring ) is 14 C .

( c of water and al are 4.2 x 10^3 J/Kg/K and 9.1 x 10^2 J/Kg/K

2. Relevant equations

Calculate the specific heat capacity of the copper . Assuming heat loss to the surrounding is negligible .

3. The attempt at a solution

Heat supplied = heat loss . However i`m struggling with the change in temperature .

Dick
Jan3-08, 02:43 AM
The change in temperature of the copper is -86C and the change in the water is +4C?? Is that what you are asking??

Kenny09
Jan3-08, 07:12 AM
No i mean about the change of a can .
It should be heat supplied = heat gained isn't it ?
Q of Copper cube = Q of can + Q of Water ?

If can and water are only one object then why would they give us C of aluminum ?

Dick
Jan3-08, 09:54 AM
I think you can take the temperature change of the can to be the same as the water it contains.