Find the inner curved surface area and weight of a lead pipe 7 m long , if the external diameter of the pipe is 4.4 cm and the thickness of the lead is 2 mm and 1 cu cm of lead weights 11 g .
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Answer:
We know that,
R=
2
d
=
2
2.4
=1.2cm
External Radius (R)=1.2cm
Thickness =2mm=0.2cm
Inner Radius (r)=1.2−0.2
=1cm
Height (h) =3.5cm=350cm
Volume of hollow cylinders =π(R
2
−r
2
)h
=
7
22
×(1.2
2
−1
2
)×350
=
7
22
×(1.44−1)×350
=22×0.44×50
=22×
100
44
×50
=484cm
3
Weight of 1cm
3
=11g
Weight of 484cm
3
=484×11
=5324g
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