August 2022 1 6 Report
Подъёмный кран мощностью 5кВт поднимает бетонную плиту массой 1т на высоту 20м за время 50с. Определите:
А. полезную работу
В. затраченную работу
С. КПД установки
ПОМОГИТЕ ПОЖАЛУЙСТА ​
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