Calculating the Volume of the Cuboid Container

Oct 13, 2025 by wbrum.org 15 views

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Introduction

In this problem, we are given a metal container in the shape of a cuboid with dimensions 18cm, 12cm, and 10cm. The container is completely filled with water. Then, seven solid metal spheres, each with a radius of 3cm, are dropped into the container, and they sink completely. We need to find the volume of water displaced by the spheres.

Calculating the Volume of the Cuboid Container

To find the volume of water in the cuboid container, we need to calculate the volume of the container itself. The formula for the volume of a cuboid is:

Volume = Length × Breadth × Height

In this case, the length, breadth, and height of the cuboid are 18cm, 12cm, and 10cm, respectively.

Volume = 18cm × 12cm × 10cm Volume = 2160 cubic centimeters

Calculating the Volume of a Single Sphere

To find the volume of water displaced by the spheres, we need to calculate the volume of a single sphere. The formula for the volume of a sphere is:

Volume = (4/3) × π × Radius^3

In this case, the radius of the sphere is 3cm.

Volume = (4/3) × π × (3cm)^3 Volume = (4/3) × π × 27 cubic centimeters Volume = 113.09733552923255 cubic centimeters

Calculating the Total Volume of Water Displaced by the Spheres

Since there are seven spheres, we need to multiply the volume of a single sphere by 7 to find the total volume of water displaced by the spheres.

Total Volume = 7 × 113.09733552923255 cubic centimeters Total Volume = 791.6823456736219 cubic centimeters

Comparing the Volume of Water in the Cuboid Container and the Spheres

Now, we need to compare the volume of water in the cuboid container and the volume of water displaced by the spheres.

Volume of Water in the Cuboid Container = 2160 cubic centimeters Volume of Water Displaced by the Spheres = 791.6823456736219 cubic centimeters

Since the volume of water displaced by the spheres is less than the volume of water in the cuboid container, the spheres will sink completely, and the water level in the container will rise.

Conclusion

In this problem, we calculated the volume of water in a cuboid container and the volume of water displaced by seven solid metal spheres. We found that the volume of water displaced by the spheres is less than the volume of water in the cuboid container, and the spheres will sink completely, causing the water level in the container to rise.

Key Takeaways

The volume of a cuboid is calculated by multiplying its length, breadth, and height.
The volume of a sphere is calculated using the formula (4/3) × π × Radius^3.
The total volume of water displaced by the spheres is calculated by multiplying the volume of a single sphere by the number of spheres.

Practice Questions

A metal container in the shape of a cuboid with dimensions 20cm, 15cm, and 12cm is completely filled with water. If five solid metal spheres, each with a radius of 4cm, are dropped into the container, what will be the new water level in the container?
A metal container in the shape of a cuboid with dimensions 25cm, 18cm, and 15cm is completely filled with water. If eight solid metal spheres, each with a radius of 5cm, are dropped into the container, what will be the new water level in the container?

Answer Key

The new water level in the container will be higher than the initial water level.
The new water level in the container will be higher than the initial water level.

References

[CBSE Board] (https://www.cbse.nic.in/)
[Mathematics Formulae] (https://www.mathopenref.com/)

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Q1: What is the formula for the volume of a cuboid?

A1: The formula for the volume of a cuboid is Volume = Length × Breadth × Height.

Q2: How do I calculate the volume of a sphere?

A2: To calculate the volume of a sphere, you can use the formula Volume = (4/3) × π × Radius^3.

Q3: What is the relationship between the volume of water in a cuboid container and the volume of water displaced by spheres?

A3: The volume of water displaced by the spheres is less than the volume of water in the cuboid container, causing the water level in the container to rise.

Q4: How do I calculate the total volume of water displaced by multiple spheres?

A4: To calculate the total volume of water displaced by multiple spheres, you can multiply the volume of a single sphere by the number of spheres.

Q5: What happens when the spheres are dropped into the container?

A5: When the spheres are dropped into the container, they will sink completely, causing the water level in the container to rise.

Q6: Can the spheres be floating in the container?

A6: No, the spheres will sink completely in the container, as the volume of water displaced by the spheres is less than the volume of water in the cuboid container.

Q7: How do I determine the new water level in the container after the spheres are dropped?

A7: To determine the new water level in the container, you can compare the volume of water displaced by the spheres with the volume of water in the cuboid container.

Q8: What is the significance of the radius of the sphere in calculating its volume?

A8: The radius of the sphere is an important factor in calculating its volume, as it is used in the formula Volume = (4/3) × π × Radius^3.

Q9: Can the volume of water in the cuboid container be greater than the volume of water displaced by the spheres?

A9: No, the volume of water displaced by the spheres is less than the volume of water in the cuboid container, causing the water level in the container to rise.

Q10: What is the relationship between the dimensions of the cuboid container and the volume of water in it?

A10: The dimensions of the cuboid container (length, breadth, and height) are used to calculate the volume of water in it, using the formula Volume = Length × Breadth × Height.