The volume of a metallic cyrindical pipe is 1221 cubic cm,it’s lenghth is 10.5cm.if the external diameter is 38 com find the internal radius
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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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