Question

Сириус. Курсы. Физика 7 класс Стеклянную литровую банку заполнили керосином. Определите массу пустой банки, если известно, что масса полной в 1,4 1 , 4 раза больше массы налитого керосина. Ответ дайте в г, округлив до целого числа. Плотность керосина 0,8 0 , 8 г/см3 3 . 2 попытки Умоляю, помогите

Answer 1

Ответ:

320

Объяснение:

1 литр = 1000 см3

плотность - 0,8г/см3

800г - масса керосина

800 * 1,4 - 800 = 320г

Если больше данных нет, то вот так

Answer 2

Problem Analysis

To solve this problem, we need to determine the mass of an empty glass jar. We are given that the mass of the full jar is 1.4 times the mass of the kerosene it contains. We also know the density of kerosene is 0.8 g/cm³.

Solution

Let's assume the mass of the kerosene is m grams. According to the problem statement, the mass of the full jar is 1.4 times the mass of the kerosene. Therefore, the mass of the full jar is 1.4m grams.

We can calculate the volume of the kerosene using its density. The formula to calculate volume is:

Volume = Mass / Density

In this case, the volume of the kerosene is m / 0.8 cm³.

The volume of the jar is equal to the volume of the kerosene. Let's assume the volume of the jar is V cm³.

Now, we can calculate the mass of the empty jar by subtracting the mass of the kerosene from the mass of the full jar:

Mass of empty jar = Mass of full jar - Mass of kerosene

Since the mass of the full jar is 1.4m grams and the mass of the kerosene is m grams, we can substitute these values into the equation:

Mass of empty jar = 1.4m - m = 0.4m grams

To find the value of m, we need to calculate the volume of the jar. We can use the formula:

Volume = Length x Width x Height

Since the jar is cylindrical, we can use the formula for the volume of a cylinder:

Volume = πr²h

We know the density of the kerosene is 0.8 g/cm³, so we can substitute this value into the equation:

m / 0.8 = πr²h

We also know that the volume of the jar is equal to the volume of the kerosene, so we can substitute V for m / 0.8:

V = πr²h

Now, we can solve for m:

m = V x 0.8 / πr²h

Substituting this value of m into the equation for the mass of the empty jar, we get:

Mass of empty jar = 0.4 x (V x 0.8 / πr²h)

To find the mass of the empty jar in grams, we need to know the values of V, r, and h.

Calculation

Unfortunately, we don't have the values of V, r, and h in the problem statement. Please provide these values so that we can calculate the mass of the empty jar.