May 2021 0 7 Report
СРОЧНО!!! ДАЮ 30 БАЛЛОВ. Мотор экскаватора имеет мощность 14,7 кВт. За час экскаватор поднял 400 т земли на высоту 1,6 м. Каков коэффициент полезного действия экскаватора? Принять g=9,8 H/кг
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