Thursday

August 28, 2014

August 28, 2014

Posted by **sona** on Tuesday, November 16, 2010 at 11:44am.

- maths -
**MathMate**, Tuesday, November 16, 2010 at 11:52amArea of a circle = πr²

Inner diameter = 12 cm

Inner radius = 6 cm

Outer radius = 6+1 = 7 cm

Cross sectional area of an annulus (ring)

= π(r2²-r1²)

=(7²-6²)π

=13π cm²

Volume for a 1 metre tube:

V=13π&100cm cm³

=1300 cm³

Mass ("weight")

=volume * density.

**Related Questions**

maths - the thickness of a metallic tube is 1 cm and the inner diameter of tube ...

Math - A cylindrical tube is open at both ends.the internal diameter tube 10.4cm...

physic - After skiding down a snow-covered hill on an inner tube, Ashley is ...

physics - After sliding down a snow-covered hill on an inner tube, Ashley is ...

Collision in One Dimension - After skiding down a snow-covered hill on an inner ...

Heat Transfer - A hollow tube having an inside diameter of 2.5 cm and a wall ...

Heat Transfer - A hollow tube having an inside diameter of 2.5 cm and a wall ...

Geometry - A mailing tube is 25" long with a diameter of 4". What is the volume ...

Engineering/Algebra - A cardboard tube is loaded with a 15.3 N axial load. The ...

physics - Water flows through a horizontal tube of diameter 2.9 cm that is ...