a cylinder is open at both ends and is made of 1.5 cm thick metal . its external dimeter 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 1cm of the metal 7.5g
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V= pi x r ^2 x height. And you've got a hollow tube on your hands. You have 4.5cm hollowed out ( 6cm-4.5cm)-
So the formula becomes V= pi x (r2- r^2 )x height
22/7 x 15.75cm^2 x 84cm = 4,158 cm^3.
Weight
4158cm^3 x 7.5 = 31,185gram or 31.185 kg
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