A cylinder is open at both ends and is made of 1.5-cm-thick metal. its external diameter is 12cm and height is 84cm.what is the volume of metal used in making the cylinder? Also,find the weight of the cylinder if 1cm3 of the metal weighs 7.5g.
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height of cylinder = 84 cm
diameter of external cylinder = 12 radius(R)=6 cm
diameter of internal cylinder = 12-2(1.5) radius(r)=4.5 cm
12-3=9cm
volume of metal sheet=
volume of bigger cylinder - volume of smaller cylinder
R*Rh-pir*rh
\pi*h (R^2-r^2)
3.14*84(6^2-4.5^2)
263.76(15.75)
4154.22 cm^3
weight of metal =
volume X weight of unit
4154.22 X 7.5
31156.65 g or 31.15 kg
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