I have a roll of galvanized iron sheet steel.
Its width is 19mm and thickness 0.25mm
Density 7850 kg/m^3
Weight of the roll is 75kg
I want to find how long would be the roll if its unwound.
Density D = M / V
Length L = V / A
Area A = Width * Thickness
The Attempt at a Solution
I need to find the volume of the material first,
so I find the cross sectional area A from the length and thickness
A = 0.000005 m^2
For finding volume I know that D = 7850 kg / m^3 but I need to find mass (M)
So here is where I'm stuck up
Should I use Mass as 75kg
or Do I need to calculate Mass from the Weight which is 75 kg.
using W = m * g or m = W/g
even in this equation so m would be 75 / 9.8 = 7.65kg.
The final answer I have is Length = 200m but I don't know if that is correct.