Question:
A thermally insulated, closed copper vessel contains water at 15°C. When the vessel is shaken vigorously for 15 minutes, the temperature rises to 17°C. The mass of the vessel is 100g and that of the water is 200g. The specific heat capacities of copper and water are 420J/kg-K and 4200J/kg-K respectively. Neglect any thermal expansion.
(a) How much heat is transferred to the liquid-vessel system?
(b) How much work has been done on this system?
(C) How much is the increase in internal energy of the system?
Solution:
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