Question

the thickness of a metallic tube is 1cm and the inner diameter of the tube is 12cm. find the weight of 1m long tube.if the density of the meta is 7.8g/cm cube.

Answer 1

Area of a circle = ðr² 
Inner diameter = 12 cm 
Inner radius = 6 cm 
Outer radius = 6+1 = 7 cm 
Cross sectional area of an annulus (ring) 
= ð(r2²-r1²) 
=(7²-6²)ð 
=13ð cm² 
Volume for a 1 metre tube: 
V=13ð&100cm cm³ 
=1300 cm³ 
Mass ("weight") 
=volume * density. 

hope it helps

Answer 2

Answer: 202800 pi  gm

Step-by-step explanation: