Предмет: Физика, автор: ангелок22

Ведро с песком 120H поднимают с помощью неподвижного блока на высоте 10 м. действуя весом 125H определите КПД установки.

Ответы

Автор ответа: Аноним

Блок неподвижный значит пути полезной работы и затраченной равны S1=S2=S
КПД=100%* A(полезная) / А(затраченная)
А(п) =S*F(1)
A(з)=S*F(2)
КПД=100% * F(1)/F(2)=100%*120/125=96%

Ответ: 96%

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