Question

a thick hollow cylindrical pipe is 6cm in length and its whole surface area is 308 sq.cm. If the external radius is 4cm and it's material weighs 8.4gm per cubic centimetre, find it's weight​

Answer 1

Answer:

External surface area of cylinder =540π cm

2

2πRh=540π cm

2

Internal radius (r)=

2

16

=8 cm

Height (h)=15 cm

So,

2πRh=540π

2R×15=540

R×30=540

R=18 cm

Total surface area

=2π(R+r)(R−r+h)

=2π(26)(25)

=1300π cm

2

Hence, the total surface area of the cylinder =1300π cm

2

.

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