EXERCISE 1


(a) Liquid water has a heat capacity of one calorie per gram per 
degree Celsius.  What is liquid water's heat capacity in MKS units?

(b) I'm making hot chocolate for a few friends, so I put one liter of water in
a teakettle.  (One liter is 1000 cm^3, or about four cups, and weighs one kg.)
I only want hot water, not boiling water, so I want to raise the temperature
of the water from 20 degrees C to 90 degrees C.  How much heat energy will the
stove have to add to the water to reach this goal?

(c) My friends and I decide we want to drink some potent hot chocolate; so 
instead of water, I put in vodka, which is 60% water and 40% ethyl alcohol.
Now, ethyl alcohol has a heat capacity of about 0.6 calorie per gram per 
degree Celsius.  Will the vodka reach the desired temperature faster or
slower than the plain water?