Plastic pipe

Calculate the plastic pipe's weight with diameter d = 70 mm and length 380 cm if the wall thickness is 4 mm and the density of plastic is 1367 kg/m³.

Correct result:

m =  4.3 kg

Solution:

$$\begin{gathered} r_1=d\mathrm{/}2=35mm \\ {r}_2=r_1-4=31mm \\ V=V_1-V_2=\pi r_1^{2}l-\pi r_2^{2}l \\ V=\pi l(r_1^2-r_2^2)=3151.65m{m}^3 \\ m=\rho V=1367kg\mathrm{/}{m}^3\cdot 3151.65m{m}^3=4.3\text{ kg} \end{gathered}$$

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