КПД=Q1/Q2
Q1=cmΔt c=4200 m=0.2 Δt=80
Q2=q*m2 q=2.9^10^7
m2=cmΔt/(КПД*q)=4200*0.2*80/(0.5*2.9*10^7)=4.6*10^-3 кг
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Verified answer
КПД=Q1/Q2
Q1=cmΔt c=4200 m=0.2 Δt=80
Q2=q*m2 q=2.9^10^7
m2=cmΔt/(КПД*q)=4200*0.2*80/(0.5*2.9*10^7)=4.6*10^-3 кг
Verified answer
M1*q*кпд/100%=m2*c*(t2-t1)m1=m2*c*(t2-t1) : (q*кпд/100%) = 0,2*4200*(100-20)/(30*10^6*50/100) кг =
= 0,00448 кг ~ 4,5 гр