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April 24, 2014

Homework Help: college physics

Posted by cat on Monday, December 3, 2012 at 2:26pm.

An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27C. A 400-g sample of silver at an initial temperature of 87C is placed in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature of 32C. Calculate the mass of the aluminum cup. answer in g

my equation looked like this:

(1/900)[400 g x 225 g x (87-32/32-27) - (40 g x 387 g) - 225]
I honestly don't think my numbers are right. My answer was 85 g, and the homework says that I am within 10% of the correct answer though...help please!

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