Question

an iron pipe is 20 metre long and its external diameter is 8 cm if the thickness of the pipe is 1 cm and iron weight is 8 gram centimetre cube find the weight of the pipe​

Answer 1

Step-by-step explanation:

The answer is there in the image above.

plz rate

Answer 2

Answer:

Weight of the pipe = 3.696 kg

Step-by-step explanation:

External radius of the pipe = 4cm

Thickness of the pipe = 1cm

Internal radius of the pipe = (4 - 1) = 1cm

External volume = $( \frac{22}{7} \times 4 \times 4 \times 21)cm {}^{3} = 594cm {}^{3}$

Internal volume = $( \frac{22}{7} \times 3 \times 3 \times 21)cm {}^{3} = 594cm {}^{3}$

Volume of the metal = (external volume) - (internal volume)

= $(1056 - 594)cm {}^{3} = 462cm {}^{3}$

Weight of the pipe = ( 462 × 8 )g = $( \frac{462 \times 8}{1000} )kg = 3.696kg$