Posted by **Tiffany ** on Wednesday, January 30, 2013 at 5:35pm.

A 123 g cube of ice at 0◦C is dropped into 1.9 kg of water that was originally at 81◦C.

What is the final temperature of the water after after the ice melts? The latent heat of fusion of water is 3.33 × 105 J/kg .

Answer in units of ◦C

- Physics -
**Tiffany **, Wednesday, January 30, 2013 at 5:59pm
You have collected exactly 2800 aluminum cans for recycling, each with a mass of 13.6 g. How much energy is needed to melt them if their initial temperature is 26.2◦C? Assume the specific heat, the latent heat and the melting point of aluminum are 899 J/kg ·◦ C,

3.97 × 105 J/kg and 660.4 ◦C, respectively. Answer in units of J

- Physics -
**Elena**, Wednesday, January 30, 2013 at 6:52pm
Ice:

Q= λm + cm(t-0) = λm + cmt

Water

Q=cm₁(81-t)

λ=3.33•10^5 J/kg .

m=0.123 kg

m₁ = 1.9 kg

c = 4186 J/kg •◦ C

λm + cmt= c m₁(81-t)

Solve for ‚t’

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