3. +-12.5 points ZinPhysLS3 9 P.007 My Notes Ask Your Teacher Watt used brewery

Question

3. +-12.5 points ZinPhysLS3 9 P.007 My Notes Ask Your Teacher Watt used brewery horses to spin the stirrer in the experiment with which he measured the work output of horses, and Joule later applied this experiment to demonstrate the equivalence of heat and work. Assume that wart's brewery horses each did P 7S s of work per second this corresponds roughly to the definition of horsepower f Watt had three horses moving in a circle for two hours to operate a stirrer in a well-isolated container filled with 1 m3 water at an initial temperature of 37°C, to what final value did the water temperature rise (in °C)? Use this table for the specific heat capacity of water oC

Explanation / Answer

total energy provided

= (3 x 750 J/s) (2 x 3600 s )

= 162 x 10^5 J  

and Q = m C deltaT  

162 x 10^5 = 1000 x 4186 (T - 37)

T = 40.9 deg C

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