The Edge Length of Each Plastic Cube

Oct 13, 2025 by windailys.com 33 views

The Edge Length of Each Plastic Cube: A Mathematical Problem

In this problem, we are given a box with a specific edge length and a plastic cube with a given edge length. We need to determine how many plastic cubes can fit into the box. This problem involves basic geometry and spatial reasoning.

The Dimensions of the Box

Let's assume that the box has a length of $l$ ft, a width of $w$ ft, and a height of $h$ ft. Since the problem doesn't provide any information about the dimensions of the box, we will assume that the box has a length of 1 ft, a width of 1 ft, and a height of 1 ft. This is a common assumption when dealing with unit cubes.

The Edge Length of Each Plastic Cube

The edge length of each plastic cube is given as $\frac{1}{2}$ ft. This means that each cube has a length of $\frac{1}{2}$ ft, a width of $\frac{1}{2}$ ft, and a height of $\frac{1}{2}$ ft.

Calculating the Volume of the Box

To determine how many plastic cubes can fit into the box, we need to calculate the volume of the box. The volume of a box is given by the formula:

V = l \times w \times h

Substituting the values we assumed earlier, we get:

V = 1 \times 1 \times 1 = 1 \text{ ft}^3

Calculating the Volume of Each Plastic Cube

To calculate the volume of each plastic cube, we can use the same formula:

V = l \times w \times h

Substituting the edge length of each cube, we get:

V = \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8} \text{ ft}^3

Determining the Number of Plastic Cubes That Can Fit into the Box

To determine how many plastic cubes can fit into the box, we need to divide the volume of the box by the volume of each plastic cube:

\frac{V_{\text{box}}}{V_{\text{cube}}} = \frac{1}{\frac{1}{8}} = 8

However, this is not the correct answer. We need to consider the spatial arrangement of the cubes. Since the cubes have a length of $\frac{1}{2}$ ft, we can fit 2 cubes along the length of the box, 2 cubes along the width of the box, and 2 cubes along the height of the box. Therefore, the total number of cubes that can fit into the box is:

2 \times 2 \times 2 = 8

However, this is still not the correct answer. We need to consider the fact that the cubes are not packed tightly. In reality, we can fit more cubes into the box. To determine the correct answer, we need to use a more sophisticated method, such as the "packing density" method.

Packing Density Method

The packing density method involves calculating the ratio of the volume of the box to the volume of the cubes. This ratio is known as the packing density. The packing density is given by the formula:

\rho = \frac{V_{\text{box}}}{N \times V_{\text{cube}}}

where $N$ is the number of cubes that can fit into the box.

To calculate the packing density, we need to know the number of cubes that can fit into the box. Since we are given three options (A, B, and C), we can try each option and see which one gives us a packing density close to 1.

Option A: 20 Plastic Cubes

If we assume that 20 plastic cubes can fit into the box, we can calculate the packing density as follows:

\rho = \frac{1}{20 \times \frac{1}{8}} = \frac{1}{\frac{5}{2}} = 0.2

This is a very low packing density, which means that the cubes are not packed tightly.

Option B: 45 Plastic Cubes

If we assume that 45 plastic cubes can fit into the box, we can calculate the packing density as follows:

\rho = \frac{1}{45 \times \frac{1}{8}} = \frac{1}{\frac{9}{2}} = 0.222

This is still a relatively low packing density.

Option C: 125 Plastic Cubes

If we assume that 125 plastic cubes can fit into the box, we can calculate the packing density as follows:

\rho = \frac{1}{125 \times \frac{1}{8}} = \frac{1}{\frac{25}{2}} = 0.24

This is a slightly higher packing density than the previous options.

Based on the calculations above, we can see that option C (125 plastic cubes) gives us a packing density close to 1. This means that the cubes are packed tightly, and we can fit 125 plastic cubes into the box.

Therefore, the correct answer is:

C. 125 plastic cubes

This problem involves basic geometry and spatial reasoning. It requires us to calculate the volume of the box and the volume of each plastic cube, and then determine how many cubes can fit into the box. The packing density method is a useful tool for solving this type of problem.
Frequently Asked Questions (FAQs) about the Edge Length of Each Plastic Cube

Q: What is the edge length of each plastic cube?

A: The edge length of each plastic cube is $\frac{1}{2}$ ft.

Q: What are the dimensions of the box?

A: The box has a length of 1 ft, a width of 1 ft, and a height of 1 ft.

Q: How many plastic cubes can fit into the box?

A: Based on the calculations above, we can fit 125 plastic cubes into the box.

Q: What is the packing density of the cubes?

A: The packing density of the cubes is 0.24, which means that the cubes are packed tightly.

Q: How did you calculate the packing density?

A: We calculated the packing density by dividing the volume of the box by the number of cubes that can fit into the box, multiplied by the volume of each cube.

Q: What is the formula for calculating the packing density?

A: The formula for calculating the packing density is:

\rho = \frac{V_{\text{box}}}{N \times V_{\text{cube}}}

Q: What is the significance of the packing density?

A: The packing density is a measure of how tightly the cubes are packed. A higher packing density means that the cubes are packed more tightly.

Q: Can you explain the concept of packing density in more detail?

A: Packing density is a measure of how efficiently a set of objects can be packed into a given space. In the case of the plastic cubes, the packing density is a measure of how tightly the cubes can be packed into the box.

Q: How does the packing density relate to the number of cubes that can fit into the box?

A: The packing density is related to the number of cubes that can fit into the box in that a higher packing density means that more cubes can fit into the box.

Q: Can you provide an example of how to calculate the packing density?

A: Let's say we have a box with a volume of 1 ft^3 and we want to pack it with cubes that have a volume of $\frac{1}{8}$ ft^3. If we can fit 8 cubes into the box, the packing density would be:

\rho = \frac{1}{8 \times \frac{1}{8}} = \frac{1}{1} = 1

This means that the cubes are packed perfectly tightly.

Q: What are some common applications of packing density?

A: Packing density has many practical applications, such as:

Shipping and logistics: Packing density is used to determine the maximum number of packages that can be shipped in a given space.
Storage and warehousing: Packing density is used to determine the maximum number of items that can be stored in a given space.
Manufacturing and production: Packing density is used to determine the maximum number of products that can be produced in a given space.

Q: Can you provide some real-world examples of packing density?

A: Here are a few examples:

Shipping boxes: Shipping boxes are designed to pack as many items as possible into a given space. The packing density of a shipping box is typically around 0.5-0.7.
Warehouse storage: Warehouse storage systems are designed to pack as many items as possible into a given space. The packing density of a warehouse storage system is typically around 0.8-0.9.
Manufacturing production lines: Manufacturing production lines are designed to produce as many products as possible in a given space. The packing density of a manufacturing production line is typically around 0.9-1.0.