Screwdriver shaft e watt steam engine: o que têm em comum

1. Passo 1. Screwdriver shaft — faz parte de — Screwdriver. A steel rod.
2. Passo 2. Screwdriver — utiliza — Torque. The handle creates torque.
3. Passo 3. Torque — é utilizado em — Planetary gear. It transmits rotation through planet gears.
4. Passo 4. Planetary gear — faz parte de — Watt steam engine. Watt’s “sun and planet” gear got around the patent on the crank.

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