Question

Срочно кусок алюминия в 500 г нагревается тигель на примусе. До какой температуры нагреется алюминий если в примусе сгорело 50 г керосина начальная температура алюминия 20°С . КПД установки 40%

Answer 1

Дано
m1=0,5 кг
c1=900 Дж/кгград
t1=20 C
m2=0.02 кг
q2=43*10^6 Дж/кг
n=0.4
t2-?
Q1=nQ2       Q1-нагревание алюминия   Q1=m1c1(t2-t1)
Q2-теплота сгорания керосина                Q2=q2m2
m1c1t2-m1c1t1=nq2m2         m1c1t2=nq2m2+m1c1t1
t2=(nm2q2+m1c1t1)/m1c1      t2=nm2q2/m1c1+t1
t2=764+20=784 C

Answer 2

Calculation of the Final Temperature of Aluminum

To calculate the final temperature of aluminum, we can use the principle of energy conservation. The energy gained by the aluminum will be equal to the energy lost by the kerosene. We can express this relationship using the following equation:

m1 * c1 * (Tf - T1) = m2 * c2 * (T2 - Tf)

Where: - m1 is the mass of aluminum (500 g) - c1 is the specific heat capacity of aluminum (0.897 J/g°C) - Tf is the final temperature of aluminum (unknown) - T1 is the initial temperature of aluminum (20°C) - m2 is the mass of kerosene burned (50 g) - c2 is the specific heat capacity of kerosene (unknown) - T2 is the initial temperature of kerosene (unknown)

We need to find the final temperature of aluminum (Tf). To do this, we need to know the specific heat capacity of kerosene (c2) and the initial temperature of kerosene (T2). Unfortunately, the search results provided do not contain the necessary information to determine these values. Therefore, we cannot calculate the final temperature of aluminum in this case.

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