EXERCISE - 10.2
diameter 3 cm. Find the total radiating surface of hot water system.
An overhead water tanker is in the shape of a cylinder has capacity of 61.6
A closed cylindrical tank of height 1.4 m. and radius of the base is 56 cm
is made up of a thick metal sheet. How much metal sheet is required (Express
in square meters)
The volume of a cylinder is 308 cm.'. Its height is 8 cm. Find its lateral surf
and total surface area.
A metal cuboid of dimension 22 cm. x 15 cm. x 7.5 cm. was melted and ca
cylinder of height 14 cm. What is its radius?
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Answer:
Diameter = 5 cm
Radius = Diameter ÷2=5cm÷2=2.5cm
length of pipe =28m=2800cm
Total Radiating Surface of pipe = Curved surface area + 2 × Area of circular crossection
=2πrh+2πr
2
=2πr(h+r)=2×
7
22
×2.5(2800+2.5)=44039.28cm
2
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