Question

A metal pipe has a bore ( internal diameter) of 5cm . The pipe is 2mm thick all around . Find the weight in kilogram, of 2 metres of the pipe is 1 cm³ of the metal weighs 7.7 g. ​

Answer 1

Answer:

Inner diameter=5 cm. radius=2.5cm

thickness =5mm=0.5cm

outer radius=2.5+0.5=3cm

length=2m=200cm

volume of pipe=

V=Π(R

2 −r

2)h

V=3.14(3 2 −2.5 2 )∗200

V=22/7∗(9−6.25)∗200

V=12100/7cm 3

1 cm 3 of the metal weighs 7.7 g.

So, 12100/7 cm 3

weighs=7.7∗ 12100/7

gm=13310gm=13.31kg

Answer 2

⭐ Refer to the above attachment