The ratio of the volumes of a cylinder, a cone and a sphere, if each has the same diameter and same height is

If the radius of a cylinder is doubled keeping its lateral surface area the same, then what is its height ?

A sphere , a cylinder and a cone have the same radius and same height. Find the ratio of their volumes. [Hint : Diameter of the sphere is equal to the heights of the cylinder and the cone]

The ratio of the volume of two cones is 2:9 , find the ratio of their radii if the height of the second cone is double the height of the first:

A toy is in form of a cone mounted on a hemisphere on the same diameter . The diameter of the base and the height of the cone are 6 cm and 4 cm respectively. Determine the surface area of the toy . [use pi= 3.14 ]

Find the volume of a right-circular cone of base radius r and height h.

A tent is in the form of a cylinder surmounted by a cone having its diameter of the base equal to 24 m. The height of cylinder is 11 m and the vertex of the cone is 5m above the cylinder. Find the cost of making the tent, if the rate of canvas is 10 per m^(2)

What is the ratio of volume to surface area of sphere?

A sphere , a cylinder and a cone are of the same radius and same height . Find the ratio of their curved surface areas.

Equal torques are applied on a cylinder and a sphere. Both have same mass and radius rotates about its axis and sphere rotates about one of its diameter. Which will rotates acquire greater speed and why?