Given:
One liter of milk is poured into a cylindrical container of radius 10 cm.

Question:
1. Calculate the depth of the milk. Provide the answer to one decimal place.
2. If the height of the container is 0.4 m, find its radius to one decimal place.



Answer :

To solve the problem of finding the depth of the milk when one liter is poured into a cylindrical container with a radius of 10 cm, we can follow these steps:

1. Conversion of Volume:
- First, we need to convert the volume of milk from liters to cubic centimeters because the radius is given in centimeters. We know that 1 liter is equal to 1000 cubic centimeters (cm³).
- Therefore, the volume of milk in cubic centimeters is:
[tex]\[ \text{Volume} = 1 \text{ liter} = 1 \times 1000 \text{ cm}^3 = 1000 \text{ cm}^3 \][/tex]

2. Formula for the Volume of a Cylinder:
- The volume [tex]\( V \)[/tex] of a cylinder is given by the formula:
[tex]\[ V = \pi r^2 h \][/tex]
Here, [tex]\( r \)[/tex] is the radius and [tex]\( h \)[/tex] is the height or depth of the milk in the cylinder.

3. Rearrange the Formula to Solve for Height:
- To find the height [tex]\( h \)[/tex], we can rearrange the formula:
[tex]\[ h = \frac{V}{\pi r^2} \][/tex]

4. Substitute the Values and Calculate:
- Plug in the given values into the formula. The volume [tex]\( V \)[/tex] is 1000 cm³ and the radius [tex]\( r \)[/tex] is 10 cm:
[tex]\[ h = \frac{1000}{\pi \times 10^2} \][/tex]
[tex]\[ h = \frac{1000}{\pi \times 100} \][/tex]
[tex]\[ h = \frac{1000}{100\pi} \][/tex]
[tex]\[ h = \frac{10}{\pi} \][/tex]

5. Calculate the Exact Depth:
- Using the value of [tex]\(\pi \approx 3.14159\)[/tex],
[tex]\[ h = \frac{10}{3.14159} \approx 3.1830988618379066 \text{ cm} \][/tex]

6. Round the Depth to One Decimal Place:
- Finally, we round the depth to one decimal place:
[tex]\[ \text{Depth} \approx 3.2 \text{ cm} \][/tex]

So, the depth of the milk in the cylindrical container is approximately 3.2 cm.