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Calorimetry Problems

 

 

 

1.  20 grams of metal X at temperature 300K is placed in 20 grams of fluid Y which is at 250K.  If X has a lower specific heat than Y, the equilibrium temperature will be

 

(a)  250K

(b)  between 250 and 275K    

(c)  275K

(d)  between 275 and 300K

(e)  300K

 

2.  40 grams of copper, at 95 oC, is placed in 100 ml of water at 20 oC.  What is the final temperature?

 

 

 

 

 

 

 

  1. In grinding a steel knife blade, the metal can get as hot as 4000 C. If the blade has a mass of 80 g, what is the minimum

      amount of water needed at 200 C if the water is not to rise above the boiling point when the hot blade is quenched in it?

 

 

 

 

 

 

  1. Two equal mass objects make up a system that is thermally isolated from its surroundings. One object has an initial temperature

      of 1000 C and the other has an initial temperature of 00 C. What is the equilibrium temperature of the system, assuming that no

      phase changes take place for either object and that the hot object has a heat capacity that is three times that of the cold object?