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Question:

what is the advantage of dragging the dirt instead of lifting?

what is the advantage of dragging dirt in a drag line excavator

Answer:

I am guessing that by applying force in the horizontal you are using less energy. W=F*d (Work = force * distance) So if you don't have to lift the dirt (which would add distance) the you use less force hence, less energy, to drag rather than lift dirt

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