September 2021 0 7 Report
Мотор экскаватора имеет мощность 14,7 кВт. За час экскаватор поднял 400 т земли на высоту 1,9 м. Каков коэффициент полезного действия экскаватора?  

Принять g=9.8Нкг.

 

Ответ (округли до целого числа): η≈%.  

 

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