Question

the internal and external diameter of steel pipe of length 140cm are 8cm and 10cm respectively find the volume of steel and thickness of metal

Answer 1

Answer is 11000cm cube

Answer 2

Answer: The volume of steel is 3960 cm³ and the thickness of metal is 1 cm.

Step-by-step explanation:

Since we have given that

Internal diameter of steel pipe = 8 cm

Internal radius of steel pipe (r) is given by

$\frac{8}{2}=4\ cm$

External diameter of steel pipe = 10 cm

External radius of steel pipe (R) is given  by

$\frac{10}{2}=5\ cm$

Length of pipe = 140 cm

As we know the formula for "Volume of steel " :

$Volume=\pi(R^2-r^2)h\\\\Volume=\frac{22}{7}\times (5^2-4^2)\times 140\\\\Volume=22\times (25-16)\times 20\\\\Volume=22\times 9\times 20\\\\Volume=3960\ cm^3$

And the thickness of metal is given by

$R-r\\\\=5-4\\\\=1\ cm$

Hence, the volume of steel is 3960 cm³ and the thickness of metal is 1 cm.