Question

the thickness of a mettalic tube is 1cm and the inner diameter of the tube is 12cm .find the weight of 1m long tube ,if its density of the metal is 7.8g/cm^3​

Answer 1

Answer:

Inner radius,r=12/2=6cm

thickness=1cm

so,outer radius,R=6+1=7cm

height,h=1m=100cm

volume=pi×(R^2-r^2)×h

=22/7×(7^2-6^2)×100

=22/7×(49-36)×100

=22/7×13×100

286/7×100

=28600/7

since,density=7.7gm/cm^3

also,weight=volume×density

weight=28600/7×7.7gm

=31460gm

or,31.46 kg