Timber floor joist deflection calc !urgent!

[Adamtcrook]

I having some troubles with the following calculations;



and



Your help would be greatly appreciated

 

[Cubist]

It is difficult to provide help when we don't know the exact trouble that you're having. I guess that you have plugged these numbers in to a calculator and the result does not make sense?

General advice: Engineering expressions/ equations usually expect the variables to be in "standard units" like meters, newtons, etc. Therefore if you take a measurement in "mm" you must convert this number to "m" before you plug it into an expression UNLESS the author explicitly states something like "variable x is the length in mm". NOTE Be careful when converting mm² to m², etc - since 1,000mm=1m BUT 1,000,000mm²=1m² and 1,000,000,000mm³=1m². Google might be able to help you out, just type "convert mm^3 to m^3" into the search box.

 

[Otis]

Hi Adam. The final units are mm⁴. If that's not what you expect, then please provide the entire exercise, so that we can see the set up. If you used a formula, please post that, too.

?

 

[topsquark]

And what is the unit "n"?

-Dan

 

[Steven G]

And what is the unit "n"?

-Dan

As a math person it does not matter as it cancels out!