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A hollow iron pipe is 2 m long. Its external diameter is 10 cm and it is 1 cm thick. Calculate the weight of
the pipe if iron weighs 8.2 g/cm3
.

 May 19, 2020
 #1
avatar+111321 
+3

The  volume  of  the pipe  is just  the  difference  in the volumes of two cylinders  =

 

Volume  of "outside" cylinder  -  Volume of "inside" cylinder  =

 

{2m  =  200cm)

 

pi * ( 11/2)^2 * 200  -  pi * (10/2)^2 * 200  =

 

200pi [ 5.5^2 - 5^2  ] = 

 

200pi  * 5.25  =

 

1050 pi   cm^3

 

So....the weight  is

 

1050 pi cm^3  *  (8.2)g / cm^3    =    [8610 pi]   g  ≈  27049 g

 

 

 

cool cool cool

 May 19, 2020
 #2
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0

Hey CPhill!
I don't get the part where
 

pi * ( 11/2)^2 * 200  -  pi * (10/2)^2 * 200  =

can u please explain thanks.

 May 19, 2020
 #3
avatar
0

like the 11/2 part

 May 19, 2020
 #4
avatar+23566 
+2

I think that should be    9/2    rather than 11/2

 

like this:

 

 

pi * ( 10/2)^2 * 200  -  pi * (9/2)^2 * 200 

 May 19, 2020
 #5
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0

ahh ok thanks!

Guest May 19, 2020

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