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Question:

why dis the designers use hydraulic system in a crane?

in your own words please!!! science project

Answer:

Can you boil water (212F) with a hair dryer? If not, then you aren't getting close to the higher temperature for curing Sculpey (275F) A heat gun gets much hotter than a hair dryer which is designed not to cook the skin.
Because a properly sized hydraulic system can generate extreme amounts of pressure and torque with the use of a relatively small motor and pump and energy supplyTo directly lift objects with just a motor or a engine would require the prime movers to be huge, and their energy transmission systems to be equally as large.

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