Watt used brewery horses to spin the stirrer in the experiment with which he mea

Question

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 Watt's brewery horses each did

P = 750 J/s

of work per second (this corresponds roughly to the definition of horsepower). If Watt had two horses moving in a circle for one hour to operate a stirrer in a well-isolated container filled with 1 m3 water at an initial temperature of 47°C, to what final value did the water temperature rise (in °C)? Use this table for the specific heat capacity of water.

Explanation / Answer

Work done by horses = 2*750*3600 = 5400000 J

energy given to water = 5400000 J

m S (T2-T1) = 5400000

1000*4186*(T2 - 47) = 5400000

T2 = 47 + 5400000/[1000*4186]

= 48.29 °C Answer

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