Question

The internal and external diameter of a
hollow long right circular iron cylindrical
pipe of height 4 metre are 3.5 cm and 4.2
cm. If the weight of one cubic decimetre
of iron is 5 kg, find the weight of the pipe.​

Answer 1

Step-by-step explanation:

ANSWER

Let r,R and h be the inner, outer radii and height of the hollow cylindrical pipe respectively.

Given that 2r=6cm, 2R=8cm, h=28cm

Now, the volume of the pipe, V=π×h×(R+r)(R−r)

∴ Volume, V=616cu.cm

Weight of 1cu.cm of the metal =7gm

Weight of the 616cu.cm of metal =7×616gm

Thus, the weight of the pipe =4.312kg.