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April 1, 2015

April 1, 2015

Posted by **jean** on Wednesday, June 9, 2010 at 9:26pm.

- math -
**Damon**, Wednesday, June 9, 2010 at 10:16pmarea outside = pi (1/2)^2 = pi/4 in^2

area inside = pi (3/8)^2 = 9 pi/64 in ^2

so cross sectional area = .25 pi - .14 pi

= .11 pi in^2

length = 120 in

so

volume = 120*.11 pi = 13.2 pi in^3

then

(13.2 pi in^3) (1 ft^3/12^3 in^3) (490 lb/ft^3

= 3.74 pi lb

=11.76 lb

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