Posted by sona on Tuesday, November 16, 2010 at 12:09pm.
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.
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