Question

В железном баке массой 50 кг находится 100л воды на сколько изменится температура бака с водой если считать что 60 % теплоты выделяемой при сжигании древесного угля массой 1кг пойдет на нагревание. Удельная теплота сгорания древесного угля 34 МДж/кг.

Answer 1

Он изменится всего на 4%

Answer 2

Calculation of Temperature Change in the Iron Tank with Water

To calculate the change in temperature of the iron tank with water, we need to consider the heat released by burning 1 kg of wood charcoal and the specific heat capacity of water.

Given information: - Mass of the iron tank: 50 kg - Volume of water in the tank: 100 liters - Heat released by burning 1 kg of wood charcoal: 34 MJ/kg - Specific heat capacity of water: 4.18 kJ/kg·°C

To find the change in temperature, we can use the formula:

Change in temperature = (Heat released / (Mass of water * Specific heat capacity of water))

Let's calculate the change in temperature step by step:

Step 1: Convert the volume of water from liters to kilograms. The density of water is approximately 1 kg/liter. Therefore, the mass of water in the tank is 100 kg.

Step 2: Calculate the heat released by burning the wood charcoal. The heat released by burning 1 kg of wood charcoal is given as 34 MJ/kg.

Step 3: Calculate the change in temperature. Using the formula mentioned above, we can calculate the change in temperature:

Change in temperature = (34 MJ / (100 kg * 4.18 kJ/kg·°C))

Now, let's calculate the change in temperature using the given values:

Change in temperature = (34 * 10^6 J / (100 * 10^3 g * 4.18 J/g·°C))

Change in temperature = 81.34 °C

Therefore, the temperature of the iron tank with water will change by approximately 81.34 °C when 60% of the heat released by burning 1 kg of wood charcoal is used for heating the tank with water.

Please note that the above calculation assumes that there is no heat loss to the surroundings and that the iron tank and water reach thermal equilibrium.