Question

a metal pipe 63 cm long has an inner diameter 6 cm and outer diameter 7 cm . if the metal weight 7.5g per cm cube , find the weight of the metal pipe .

Answer 1

first
the outer radius of pipe = 3.5cm
volume =
$\pi \: {r}^{2} h \:$
2425.5cm^3
than
the inner radius of pipe = 3
volume = 1782cm^3
2425.5 - 1782
= 643.5 cm ^3
$like \: this$

7.5 × 643.5
= 4826.25