Question

З крапельниці накапали однакові маси води, спочатку холодної, а потім гарячої. Як і в скільки разів змінився коефіцієнт поверхневого натягу води, якщо в першому випадку утворилося 40, а в другому 48 крапель? Вважайте, що густина холодної і гарячої води однакова.

Answer 1

Відповідь:

Відповідь на мал.

Пояснення:

Answer 2

Calculation of the Surface Tension Coefficient of Water

To calculate the change in the surface tension coefficient of water when droplets of equal masses of cold and hot water are formed, we need to compare the number of droplets formed in each case.

Let's assume that in the first case, when cold water is used, 40 droplets are formed. In the second case, when hot water is used, 48 droplets are formed.

To find the change in the surface tension coefficient, we can use the formula:

Change in Surface Tension Coefficient = (Number of Droplets in the Second Case) / (Number of Droplets in the First Case)

Plugging in the values, we get:

Change in Surface Tension Coefficient = 48 / 40 = 1.2

Therefore, the surface tension coefficient of water increased by a factor of 1.2 when the water changed from cold to hot.

Please note that this calculation assumes that the density of cold and hot water is the same, as mentioned in the question.