Math Problem Statement

The volume of a spherical tank is given by \( V = \frac{4}{3} \pi r^3 \). If the volume of the tank is known, which expression can be used to find its radius?

Solution

The formula for the volume of a sphere is given by:

V=43πr3V = \frac{4}{3} \pi r^3

To solve for the radius rr in terms of the volume VV, we can rearrange this formula as follows:

  1. Multiply both sides by 34π\frac{3}{4\pi} to isolate r3r^3:

    r3=3V4πr^3 = \frac{3V}{4\pi}

  2. Now, take the cube root of both sides to solve for rr:

    r=3V4π3r = \sqrt[3]{\frac{3V}{4\pi}}

Now, we can compare this result to the answer choices:

  • Option B matches 3V4π3\sqrt[3]{\frac{3V}{4\pi}}, which is the correct form.

Thus, the answer is:

B. 3V4π3\sqrt[3]{\frac{3V}{4\pi}}

Would you like further details on this solution, or do you have any other questions?

Additional Questions for Deeper Understanding:

  1. How would the formula change if we were dealing with the surface area of a sphere instead of volume?
  2. Can you derive the formula for the surface area of a sphere using the radius found here?
  3. What if the problem gave the diameter instead of the radius — how would that affect the volume formula?
  4. How can this concept be applied in real-world scenarios involving spheres, like in calculating fuel tank volumes?
  5. What happens to the volume of the sphere if the radius is doubled?

Tip:

When solving for one variable in terms of others, always isolate the desired variable first before applying inverse operations (like taking roots or logarithms) to simplify the expression effectively.

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Math Problem Analysis

Mathematical Concepts

Geometry
Algebra
Volume of a Sphere
Solving for Radius

Formulas

V = \frac{4}{3} \pi r^3

Theorems

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Suitable Grade Level

Grades 9-10