Your opponent's serve was almost perfect, but you vigorously returned it beyond his outstretched racquet to win the point. Now the tennis ball sits wedged in the chain‐link fence around the court. What happened to the ball's kinetic energy? It has gone to heat the fence, of course, and you realize that if the fence were quite a bit colder, you might be able to measure that heat and determine just how energetic your swing really was.
Caroline Kilbourne Stahle, Dan McCammon, Kent D. Irwin; Quantum Calorimetry. Physics Today 1 August 1999; 52 (8): 32–37. https://doi.org/10.1063/1.882776
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