Question

В кастрюлю, где находится вода объёмом 2 листа при температуре 25 градусов, долили 3 литра кипятка. Какая температура воды установилась? Плотность воды 1000кг/мет в кубе

Answer 1

Q = с * ((m1 * t1) + (m2 * t2)) = 4,2 * ((2 * 25) + (3 * 100)) = 4,2(50 + 300) = 4,2 * 350 = 1470 кДж тепла в воде.

1470/4,2 * (3 + 2) = 1470/21 = 70 гр температура воды в кастрюле.

Ответ: 70 гр.

Answer 2

Problem Analysis

We have a pot of water with an initial volume of 2 liters and a temperature of 25 degrees Celsius. We then add 3 liters of boiling water to the pot. We need to determine the final temperature of the water in the pot.

Solution

To solve this problem, we can use the principle of conservation of energy. The total energy of the system (water in the pot) remains constant before and after the addition of boiling water. We can express this principle using the equation:

Initial energy = Final energy

The energy of an object can be calculated using the formula:

Energy = mass x specific heat capacity x temperature

In this case, the mass of the water in the pot remains constant at 2 liters, and the specific heat capacity of water is approximately 1000 kg/m^3. Let's calculate the initial and final energies and solve for the final temperature.

Calculation

1. Initial energy: - Mass = 2 liters = 2 kg (since the density of water is 1000 kg/m^3) - Specific heat capacity = 1000 kg/m^3 - Initial temperature = 25 degrees Celsius

Initial energy = 2 kg x 1000 kg/m^3 x 25 degrees Celsius

2. Final energy: - Mass = 5 liters = 5 kg (2 kg initial water + 3 kg boiling water) - Specific heat capacity = 1000 kg/m^3 - Final temperature = ?

Final energy = 5 kg x 1000 kg/m^3 x final temperature

Using the principle of conservation of energy, we can equate the initial and final energies:

2 kg x 1000 kg/m^3 x 25 degrees Celsius = 5 kg x 1000 kg/m^3 x final temperature

Simplifying the equation:

50,000 degrees Celsius = 5,000 x final temperature

Dividing both sides by 5,000:

final temperature = 50,000 degrees Celsius / 5,000

final temperature = 10 degrees Celsius

Answer

The final temperature of the water in the pot after adding 3 liters of boiling water is 10 degrees Celsius.