# Solution to Problem 639 | Deflection of Cantilever Beams

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## Comments

## Re: Solution to Problem 639 | Deflection of Cantilever Beams

i think you missed this sir..

-1/3(6400)(8)(8/4)..

it should be 2ft not 6ft

## Re: Solution to Problem 639 | Deflection of Cantilever Beams

The barred(x) is measured from A not from C.

## Re: Solution to Problem 639 | Deflection of Cantilever Beams

Why is there (12^3) at the end?

## Re: Solution to Problem 639 | Deflection of Cantilever Beams

The 12

^{3}is a conversion from ft^{3}to in^{3}. The product "area of moment diagram × distance" has unit of lb·ft^{3}. Take for example the triangular area in the moment diagram.(1/2)(6 ft)(5400 lb·ft)(6 ft) = 97 200 lb·ft

^{3}We need to convert it into lb·in

^{3}to make it consistent with the unit of E which is psi (or lb/in^{2}) and unit of I which is in^{4}.