- #1

jonnybmac

- 13

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**<<moderator note, moved from a homework forum, hence the template.>>**

1. Homework Statement

1. Homework Statement

I'm trying to work out what 2.29 is in an equation an engineer has used for what i believe is supposed to be the second moment of area. See photo for report.

## Homework Equations

See screenshot photo

## The Attempt at a Solution

See photo. I tried to work back to determine his units but they don't seem to tie in. 2.29 * 8.2 * 4.675^3 = 1919

But he's using kN/m and m^3 to give an answer of cm^4. Surely this doesn't work?

Also why would he use the length of the beam and load without a safety factor to determine the second moment of area.

I see he uses 2.29 in both calcs so i presume it relates to, or could be the second moment if area but it would need something to cancel out the newtons and every calc I've done for the second moment of area for an i beam doesn't give any 2.29

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