Use the relationship among the formulas for the volumes of cones, cylinders, and spheres to solve the following problem. The volume of a cylinder is 36 cm3

. What is the volume of a sphere if its radius is the same as the cylinder’s and the height of the cylinder is equal to the sphere’s diameter?(1 point)
Responses

24 cm3

12 cm3

54 cm3

18 cm3

1 answer

To solve this problem, we will first outline the relevant formulas and relationships among the volumes of a cylinder, sphere, and cone.

  1. Volume of a Cylinder: The formula for the volume of a cylinder is given by:

    \[ V_{cylinder} = \pi r^2 h \]

    where \( r \) is the radius and \( h \) is the height.

  2. Volume of a Sphere: The formula for the volume of a sphere is given by:

    \[ V_{sphere} = \frac{4}{3} \pi r^3 \]

    where \( r \) is the radius.

  3. Relationship: In the problem, we have:

    • The volume of the cylinder \( V_{cylinder} = 36 \) cm³.
    • The radius of the sphere is the same as the radius of the cylinder \( r \).
    • The height of the cylinder is equal to the diameter of the sphere, hence \( h = 2r \).

Using the given volume of the cylinder, we can find the radius.

\[ 36 = \pi r^2 h \]

Substituting \( h = 2r \):

\[ 36 = \pi r^2 (2r) = 2\pi r^3 \]

Now, solving for \( r^3 \):

\[ r^3 = \frac{36}{2\pi} = \frac{18}{\pi} \]

Next, we substitute \( r^3 \) into the volume formula for the sphere:

\[ V_{sphere} = \frac{4}{3} \pi r^3 \]

Substituting our expression for \( r^3 \):

\[ V_{sphere} = \frac{4}{3} \pi \left(\frac{18}{\pi}\right) = \frac{4}{3} \cdot 18 = 24 \]

Thus, the volume of the sphere is:

\[ \boxed{24 \text{ cm}^3} \]