A hot water system (Geyser) consists of a cylindrical pipe of length 14 m and diameter 5 cm. Find the total radiating surface of hot water system.

The shape of solid iron rod is a cylindrical. Its height is 14 cm and base diameter is 9 cm then find the total Volume of 60 such rods.

The shape of solid iron rod is a cylindrical. Its height is 20 cm and base diameter is 14 cm. Then find the total volume of 60 such roads.

A storage tank consists of a circular cylinder with a hemisphere stuck on either end. If the external diameter of the cylinder be 1.4 m. and its length be 8 m. Find the cost of painting it on the outside at rate of Rs. 20 per m^(2) .

An iron pillar consists of a cylindrical portion of 2.8 m. height and 20 cm. in diameter and a cone of 42 cm. height surmounting it. Find the weight of the pillar if 1 cm^(3) of iron weighs 7.5 g.