Question

The length of a metallic tube is 1 metre, its thickness is 1 cm and its inner diameter is 12cm. find the weight of the tube if the density of the metal is 7.7 grams per cubic centimetre.

Answer 1

Answer:

Step-by-step explanation:

inner diameter of a tube =12cm

inner radius r=12/2=6cm

thickness of metal =1m

outer radius [R]=6+1=7cm

length of tube =[h]=1m=100cm

volume of metal used =πR²h

πh[R²-r²]=πh[R+r] [R-r]

=πh [R²-r²]=πh [R+r] [R-r]

22/7×100 [7+6] [7-6] cm³

2200/7×13×1cm³

28600/7 cm³

weight of 1cm³ metal= 7.7g

total weight = 28600/7×7.7g

=31460 g

31.46 kg