The volume of the metal in a hollow cylindrical pipe is 748 Cm cube. its length is 14 cm and its external radius is 9 cm. find its thickness.
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The volume of metallic cylindrical pipe is 748 cm
3
. Its length is 14 cm and its external radius is 9 cm. Find its thickness.
A
1 cm
Correct Answer
B
2 cm
C
4 cm
Your Answer
D
3 cm
Medium
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Correct option is
A
1 cm
Volume of a hollow Cylinder =π(R 2
−r 2 )h
Given, volume of the hollow cylinder =
722×(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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