The volume of a metallic cylindrical pipe is 748 cm³. Its length is 14 cm and its external radius is 9 cm. Find its thickness.
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Answer:
Volume of a hollow Cylinder =π(R
2
−r
2
)h
Given, volume of the hollow cylinder =
7
22
×(9
2
−r
2
)×14=748cm
3
=>9
2
−r
2
=17
=>81−r
2
=17
=>r
2
=64
=>r=8cm
Thickness = Outer radius − Inner radius =9−8=1cm
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