A cylindrical tube opened at both ends is made of iron sheet which is 2cm thick. If the outer diameter is 15 cm and its length is 100cm, find how many cubic centimeters of iron has been used in making the tube?

A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank.

A fez, the cap used by the Turks, is shaped like the frustum of a cone.If its radius on the open side is 10 cm, radius at the upper base is 4 cm and its slant height is 15 cm, find the area of material used for making it.

A cylindrical road-roller made of iron is 1 m long. Its internal diameter is 54 cm and the thikcness of the iron sheet used in making the rolleris 9cm. Find the mass of the roller, if 1 cm^3 iron has 7.8 g mass. (Use pi = 3.14)

Rachel, an engineering student, was asked to make a model shaped like a cyclinder. with two cones attached at its two ends by using a thin aluminium sheet. The diameter of the model is 3 cm and its length is 12 cm. If each cone has a height of 2 cm, find the volume of air contained in the model the Rachel made. (Assume the outer and inner dimensions of the model to be nearly the same.)

An oil funnel made of tin sheet consists of a cylindrical portion 10 cm long attached to a frustum of a cone. If the total height is 22 cm, diameter of the cylindrical portion is 8 cm and the diameter of the top of the funnel is 18 cm, find the area of the tin sheet required to make the funnel.

A metallic toy is in the shape of a cylinder whose both ends are conical in shape diameter of circular cross-section of cylinder is 6 cm and its height is 10 cm the length of the toy is 18 cm find the cost of gold plating it Rs. 100 per cm^2 .

Coffee is coming out from a conical filter, with height and diameter both are 15 cm into a cylindrical coffee pot with a diameter 15 cm. The rate at which coffee comes out from the filter into the pot is 100 cu cm/min. The rate (in cm/min) at which the level in the pot is rising at the instance when the coffe in the pot is 10 cm, is

A box with lid is made of 2 cm thick wood. Its external length, breadth and height are 26 cm, 20cm and 15 cm, respectively. How many cubic cm of liquid can its store? Also, find the volume of wood used in it.