Question

В идеальной тепловой машине за счет каждого кДж получаемого от нагревателя, совершается работа 300 Дж. Определить КПД машины и температуру нагревателя, если температура холодильника равна 17 с Цельсия. Помогите пожалуйста^^

Answer 1

t1-t2/t1*100%=n -кпд идеальной машины

300-290/300*100= 3,33333333333333%

ответ: кпд=3% T1=300K=27C

Answer 2

Calculation of Efficiency and Heater Temperature in an Ideal Heat Engine

To determine the efficiency and heater temperature of an ideal heat engine, we need to use the given information. Let's break down the problem step by step:

1. The work done by the heat engine is given as 300 J. 2. The heat engine is considered ideal, meaning it operates without any energy losses. 3. The temperature of the refrigerator is given as 17 degrees Celsius.

To calculate the efficiency (η) of the heat engine, we can use the formula:

η = (Work output / Heat input) * 100%

In this case, the work output is given as 300 J. We need to find the heat input.

To find the heat input, we can use the formula:

Qh = Qc + W

Where: - Qh is the heat input from the heater, - Qc is the heat rejected to the cooler (refrigerator), and - W is the work done by the heat engine.

Since the heat engine is ideal, there are no energy losses, so the heat input is equal to the heat output.

Therefore, we have:

Qh = Qc + W = Qc + 300 J

Now, let's find the temperature of the heater (Th) using the formula:

Qh = mc * ΔTc

Where: - mc is the mass of the coolant (refrigerator), - ΔTc is the change in temperature of the coolant.

Since the temperature of the refrigerator (Tc) is given as 17 degrees Celsius, we can assume that the change in temperature (ΔTc) is zero. Therefore, the heat rejected to the cooler (Qc) is zero.

Now, we can substitute the values into the equation:

Qh = 0 + 300 J

To calculate the efficiency (η), we can use the formula mentioned earlier:

η = (Work output / Heat input) * 100%

Substituting the values, we have:

η = (300 J / 300 J) * 100% = 100%

Therefore, the efficiency of the heat engine is 100%.

To summarize: - The efficiency (η) of the heat engine is 100%. - The temperature of the heater (Th) cannot be determined with the given information.

Please note that the temperature of the heater cannot be determined without additional information, such as the specific heat capacity of the coolant or the change in temperature.