Двигатель внутреннего сгорания совершил полезную работу равную 0,023гдж и при этом израсходовал 2 кг бензина определите кпд этого двигателя

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% 

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