Question

9. Затем в цилиндр поместили вторую льдинку, также имеющую массу 10 г и взятую при температуре её плавления. Какая температура установится в цилиндре через продолжительное время? Ответ дайте в градусах Цельсия, округлив до целого числа. Теплообменом с окружающей средой можно пренебречь. Число: 10. Каким будет уровень воды в измерительном цилиндре через продолжительное время после помещения туда второй льдинки? Ответ дайте в миллилитрах, округлив до целого числа. Плотность льда 900 кг/м3. Пока льдинки плавали, они не касались дна или стенок сосуда. Число:

Answer 1

Ответ:

9) 3

10) 220

Объяснение:

Answer 2

Calculation of Final Temperature in the Cylinder

To determine the final temperature in the cylinder after placing the second ice cube, we need to consider the conservation of energy. Since we can neglect heat exchange with the surroundings, the total energy of the system remains constant.

Let's assume the initial temperature of the first ice cube is T1 (in degrees Celsius) and its mass is 10 g. The initial temperature of the second ice cube, which is also taken at its melting point, is T2. Both ice cubes will eventually reach the same final temperature, denoted as Tf.

The energy gained by the first ice cube as it warms up from T1 to Tf is given by the equation:

Q1 = m1 * c * (Tf - T1)

where m1 is the mass of the first ice cube (10 g) and c is the specific heat capacity of ice.

Similarly, the energy gained by the second ice cube as it warms up from T2 to Tf is given by:

Q2 = m2 * c * (Tf - T2)

where m2 is the mass of the second ice cube (10 g).

Since the total energy of the system remains constant, we can equate Q1 and Q2:

m1 * c * (Tf - T1) = m2 * c * (Tf - T2)

Simplifying the equation:

Tf = (m1 * T1 + m2 * T2) / (m1 + m2)

Now, let's substitute the given values into the equation:

m1 = 10 g T1 = temperature of the first ice cube (not provided) m2 = 10 g T2 = temperature of the second ice cube (taken at its melting point)

Since the temperatures of the ice cubes are not provided, we cannot calculate the final temperature in the cylinder without that information.

Calculation of Water Level in the Measuring Cylinder

To determine the water level in the measuring cylinder after placing the second ice cube, we need to consider the displacement of water when the ice cubes melt.

The volume of water displaced by the melting ice cubes is equal to the volume of the ice cubes. The volume of each ice cube can be calculated using its mass and density:

Volume of each ice cube = mass / density

Given: Density of ice = 900 kg/m³ Mass of each ice cube = 10 g

Converting the mass of each ice cube to kilograms: Mass of each ice cube = 10 g = 0.01 kg

Calculating the volume of each ice cube: Volume of each ice cube = 0.01 kg / 900 kg/m³

Since the density of water is 1000 kg/m³, the volume of water displaced by each ice cube is equal to the volume of the ice cube.

Therefore, the water level in the measuring cylinder after placing the second ice cube will increase by the volume of the ice cube.

Please note that without the initial water level in the measuring cylinder, we cannot provide the exact water level after placing the second ice cube.