Problem 9.(adsbygoogle = window.adsbygoogle || []).push({});

A student drops metallic objects into a

224 g steel container holding 325 g of water

at 28±C. One object is a 472 g cube of copper

that is initially at 87 degrees C, and the other is a

chunk of aluminum that is initially at 9 degreesC.

To the students's surprise, the water reaches

a final temperature of 28 degreesC, precisely where

it started.

What is the mass of the aluminum chunk?

Assume the specifc heat of copper and alu-

minum are 387 J/kg degrees C

± C and 899 J/kg degrees C

Note: Would you used: m*c*delta t = m*c*delta t

If so what's next?

Problem 12.

Given: specific heat of water = 4186 J/kg degrees Ceicuis

and water's latent heat of fusion = 3.33 *10^5 J/kg.

A 0.012 kg cube of ice at 0.0degrees Ceicuis is added to

0.459 kg of soup at 80.4degrees Ceicuis.

Assuming that the soup has the same specific

heat capacity as water, find the final tem-

perature of the soup after the ice has melted.

Answer in units of degrees Ceicuis.

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# Homework Help: Some tough physics problems

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