Question

°° The external diameter of a 35-cm-long metal pipe is 10 cm. If the pipe is 1 cm thick and the density of the metal is 7.8 g/cm^3, find the volume of the metal used in the pipe and the mass of the pipe.°°


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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,

7

12100

cm

3

weighs=7.7∗

7

12100

gm=13310gm=13.31kg

Explanation:

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