Предмет: Физика, автор: AlexNik1999

Помогите решить пжл. Равномерно поднимая груз весом 100 Н с помощью подвижного блока, рабочий прикладывает силу 70 Н. Каков КПД этого блока?

Ответы

Автор ответа: Аноним

18

надо найти соотношение полезной работы к затраченной. 70/100=70%

КПД=70%

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