Problema Solution
a copper pipe has external diameter 18mm and thickness 2mm. the density of copper is 9g/cm^3 and the price of copper is $150 per tonne.what is the cost of the copper in a length of 5m of this pipe
Answer provided by our tutors
Density=mass/volume
Mass=volume*density
Mass=[pi*{Radius1^2 -Radius2 ^2}*length]*Density
Radius1=outer radius, radius2=inner radius
Mass=3.14*{9^2 - 7^2}*5000*9/1000
Mass=3.14{81 - 49}*5000*9/1000
Mass=4521.600 grammes
Mass=4.5216 kg
Mass=4.5216/1000 tonne
Price of copper =Weight of 5 mtr pipe in ton*price/ton
Price of copper[4.5216/1000] *150
Price of copper=0.67824 $