With this estimation of the energy a cow eats, you could launch a cow out of a cannon at 14 km/s. When you take into account that Earth’s escape velocity is 11.2 km/s, you could launch the cow into outer space with the energy it consumes during its adolescence.
The cow would likely be shredded to bits by the force, but let’s not start questioning why we are launching a cow in the first place. The article explains all the basis for the estimate, and goes further to explain how cow manure is a viable source of energy, with 4,800 kcal/kg released through combustion, it’s comparable to coal—without all of the pressure, heat and millions of years required!
