If the rate of change of volume of a sphere is numerically equal to that of the radius of the sphere, find the radius of the sphere.

Find the rate of change of the volume V of a sphere of radius r w.r.t change in the radius.

The sum of the surface areas of a rectangualr parallelopiped with sides x, 2 x and x/3 and a sphere is given to be constant. Prove that the sum of their volumes is minimum, if x is equal to three times the radius of the sphere. Also find the minimum value of the sum of their volumes.

Find the volume of a sphere of radius 1 cm.

Find the volume of a sphere of radius 4 cm.

If a sphere is inscribed in a cube, find the ratio of the volume of cube to the volume of the sphere.

Find the surface area of the sphere of radius: 5 cm?

If the radius of a sphere is doubled, what is the ratio of the volume of the first sphere to that of the second sphere?

If the radius of a sphere is doubled, what is the ratio of the volume of the first sphere to that of the second sphere?

Find the volume of a sphere whose radius is 5 m