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ПОПРОБУЙ ЗНАНИЯ ПЛЮС СЕГОДНЯ
майло2
майло2
18.12.2015
Физика
5 - 9 классы
ответ дан • проверенный экспертом
Двигатель внутреннего сгорания совершил полезную работу, равную 2.3 × 10 в пятой степени кДж и при этом израсходовал бензин массой 2 кг. Вычислите КПД этого двигателя
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ответ, проверенный экспертом
4,3/5
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Участник Знаний
Дано:
Апол = 2,3*10 ³кДж = 2,3*10⁶ Дж - полезная работа
m = 2 кг
q = 46 200 000 Дж/кг = 46,2*10⁶ Дж/кг - теплота сгорания бензина
КПД - ?
При сгорании бензина выделится
Q = q*m = 46,2*10⁶*2 = 92,4*10⁶ Дж
Совершенная работа равна выделившейся теплоте:
Асов = Q
Коэффициент полезного действия:
КПД = Апол * 100% / Асов = 2,3*10⁶ *100% / 92,4*10⁶ ≈ 25%
Объяснение: