Burning a cow would produce a lot of energy for a short while, but burning the cow's dung would provide less power for the life of the cow.
You could also tie a rope to the cow, push it off a cliff, and use the falling weight to turn a turbine. Although this would not the best way to get horsepower out of a cow.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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That depends on how you get the horsepower out.
Burning a cow would produce a lot of energy for a short while, but burning the cow's dung would provide less power for the life of the cow.
You could also tie a rope to the cow, push it off a cliff, and use the falling weight to turn a turbine. Although this would not the best way to get horsepower out of a cow.