Question
A hollow cylindrical pipe is made of iron. The
difference between the outer and inner curved surface area is 176 cm². The height of the pipe is 28 cm, and the sum of the inner and outer radius is 30 cm. Find the total surface area of the hollow cylindrical pipe.Solution
We have -2 π h (R-r) = 176 = 2×22/7×28(R-r) =176 R-r = 1 Also given – R + r = 30 Then – R = 15.5cm, r = 14.5cm. So, the total surface of the hollow cylinder = 2 π h(R-r) +2 π (R2-r2) =2 π (R +r) [h +R-r] =2×22/7×30(28+1) =2×22/7×30×29 =38280/7  =5468.5cm2
The National Academy of Agricultural Research Management is situated at:
The percentage of the laggards is
Which one of the following mineral is the main source of Boron in soils
T and V system, 1974 started by Daniel Benor is also known as
Symptoms appear as cup shaped, distorted and abnormally dark green leaves. In wheat and barley young leaves appear thread like .Identify the reason.
Which of these green house gas is most abundant in the atmosphere?
Which one disease of wheat causes restriction in export of wheat from India?
The extension work must be based on the interest of
The World Trade Organization (WTO) is the successor to
. ……………………is an idea, practice or object that is perceived as new by an individual or other unit of adoption.
...
Relevant for Exams:
