Предмет: Физика, автор: diana582128

На наклонной плоскости тележку массой 120 кг подняли на высоту 1,5 м , прикладывая силу 500Н. Вычислите КПД наклонной плоскости, если её длина равна 4,8 м.

Ответы

Автор ответа: loloshkafadir

Ответ:

75%

Объяснение:

Привет) попробуем решить.фух надеюсь КПД не будет равен 100%))

КПД обозначу буквой n. n=Aп\Aз*100% Aп=mgh=120кг*10н\кг*1.5м=1800Дж

2)мы нашли полезную работу найдем затраченную Аз=F*L L-это длина)

Аз=500Н*4.8м=2400Дж теперь найдем КПД, n=1800дж\2400дж*100%=75%.

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