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September 18, 2014

September 18, 2014

Posted by **Tia** on Tuesday, December 4, 2007 at 8:30pm.

What was the final temperature of the coins? [One-cent coins are made of a metal alloy - mostly zinc - with a specific heat capacity of 390 J/(kg*K).]

I know that:

Mass,coins=.615 kg

Mass,water=.244 kg

c,coin=390 J/(kg*K)

c,water=418.6 J/(kg*K)

Ti, coins= 100C, 373.15K

Ti, water= 20C, 293.15K

The problem asks for the Tf of the coins, but I'm still missing the Tf of the water...I'm thinking it has something to do with the equilibrium point, but I dont' know that that is!

Heat lost by the coins + heat gained by the water = 0

mass x specific heat x (Tf - Ti) + mass x specific heat x (Tf - Ti) = 0

- Physics, almost have it! -
**DrBob222**, Tuesday, December 4, 2007 at 11:16pmanswered in a duplicate post above.

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