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The Theoretical Minimum: What You Need to Know to Start Doing Physics by George Hrabovsky, Leonard Susskind

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Lecture 5: Energy

“Old timer, what are you looking for under the locomotive?”

Lenny loved the big steam locomotives, so now and then, on their days off, George took him down to the train yard. Today, they found a confused old man who looked as if he had lost something.

“Where’s the horse that pulls this thing?” the old timer asked George.

“We’ll, it don’t need no horse. Here, I’ll show you how it works. You see this place over here,” he said, pointing. “That’s the fire box where they burn the coal to get out the chemical energy. Then this, right next to it, is the boiler where the heat boils the water to make steam. The steam pressure does work against the piston in this here box. Then, the piston pushes against these rods, and they make the ...

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