Q. 245.0( 1 Vote )
A storage tank consists of a circular cylinder with a hemisphere adjoined 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 the rate of Rs. 10 per m2.
The figure is given below:
The curved surface area of a cylinder = 2πrh
The curved surface area of hemisphere = 2πr2
Given: External Diameter of the cylinder = 1.4 m
Length of the cylinder = 8 m
Cost of painting on the outside = Rs. 10 per m2
Thus r = 0.7m and h = 8m
Total curved surface area of the tank = 2πrh + 2πr2
⇒ Total curved surface area
Therefore, the total surface area of the storage tank is 38.28 m2.
Cost of painting it on the outside at the rate of Rs. 10 per m2 =
38.28 × 10 = Rs. 382.80
Hence, the cost of painting the storage tank from the inside is Rs. 382.80.
Rate this question :
The volumes of the two spheres are in the ratio 64 : 27 and the sum of their radii is 7 cm. The difference of their total surface areas isRS Aggarwal & V Aggarwal - Mathematics
If the surface area of a sphere is then its volume isRS Aggarwal & V Aggarwal - Mathematics
The ratio of the total surface area of a sphere and a hemisphere of same radius isRD Sharma - Mathematics
The surface area of a sphere is Find its radius and volume.RS Aggarwal & V Aggarwal - Mathematics
The diameter of a sphere is 6 cm. It is melted and drawn into a wire of diameter 2 mm. Find the length of the wire.RS Aggarwal & V Aggarwal - Mathematics
How many lead shots, each 3 mm in diameter, can be made from a cuboid with dimensionsRS Aggarwal & V Aggarwal - Mathematics