Posted by Ray on Monday, November 26, 2012 at 1:03pm.
A 1.0 102 g piece of copper at a temperature of 460 K and a 2.0 102 g piece of aluminum at a temperature of 2.2 102 K are dropped into an insulated bucket containing 5.0 102 g of water at 280 K. What is the equilibrium temperature of the mixture? (Use the specific heats found in this table.)
I have 252.2tf=57692
tf=228 K
Based off of the table the specific heats for Aluminum and Copper are. Al0.900 and Copper0.215

Physics  Ray, Monday, November 26, 2012 at 1:03pm
And the answer that I have is wrong

Physics  Ray, Monday, November 26, 2012 at 1:04pm
I'm sorry for Aluminum its 0.215 and for Copper its 0.0922

Physics  Ray, Monday, November 26, 2012 at 1:13pm
The grams for Aluminum are 2.0e2 and the temperature for Aluminum is 2.2e2. The grams for water is 5.0e2.

Physics  Elena, Monday, November 26, 2012 at 1:33pm
Cu: m₁=0.1 kg, c₁=385 J/kg•K, T₁=460 K,
Al: m₂=0.2 kg, c₂=930 J/kg•K, T₂=220 K,
Water: m₃=0.5 kg, c₃=4183 J/kg•K, T₃280 K.
T=?
m₁c₁(T₁T) = m₂c₂(TT₂) +m₃c₃(TT₃)
T= (m₁c₁T₁ + m₂c₂T₂ + m₃c₃T₃)/(m₁c₁ + m₂c₂ + m₃c₃)=
...=278.1 K

Physics  This Girl, Monday, November 26, 2012 at 7:22pm
woah!

Physics  Ray, Tuesday, November 27, 2012 at 3:02pm
Thank you Elena!
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