Предмет: Физика, автор: zukdasa112

крч на спиртовке нагрели воду м=175г от 20 до 80 градусов,нач. масса со спиртом 170г а конечная 163. Найдите кпд нагревания установки

Ответы

Автор ответа: zinovicgrigorij
1

Ответ: 23,3%

Объяснение:

Дано:

m1=175г=0,175кг

с=4200Дж/кг°С

t1=20°C

t2=80°C

m2=170г=0,17кг

m3=163г=0,163кг

q=2,7*10⁷Дж/кг

---------------

η-?

η=Q1/Q2=c*m1*(t2-t1)/(q*(m2-m3))=4200*0,175*(80-20)/(2,7*10⁷*(0,170-0,163))=0,233*100%=23,3%


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