Question

please do the question...and please if u don't know then no need to answer please......
help me in this question​

Answer 1

Answer:

Height of the pipe= 21m = 21×100= 2100cm

Exterior diameter= 8cm

Exterior radius[R] = 8/2 = 4cm

Thickness = 1cm

Interior radius [r] = Exterior radius - Thickness

= 4cm - 1cm

= 3cm

Volume of the pipe = pie(R^2 - r^2)h

=[22/7(4^2 - 3^2)2100]cm^3

=[22/7(16-9)2100]cm^3

=[22/7×7×2100]cm^3

=[22×7×300]cm^3

=46200cm^3

WEIGHT = VOLUME × DENSITY

= 46200 × 8

= 369600gm

IN KILOGRAM = 369600/1000

= 369.6kg

Answer 2

Answer:

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