correct answer is
since 1 inch = .0254 m
Ok the Question Reads:
Convert 28lb/in^2 to Newtons/m^2. (1lb = 0.2248 Newtons, 1in = 2.540cm)
This is my incorrect attempt at working it out
=28*0.2248*254^2
=406089.5104
The Correct answer (obtained from a online conversion calculator) is
193053.2038
How do I arrive at that answer
Convert Pounds to Euro quickly here. Updated daily Pounds to Euro exchange Rates.
Always use units in your conversion calculation.
28lbf/in^{2} x 4.448N/lbf x (39.37in/m)^{2} = 193000 N/m^{2}
I happen to remember that there are 25.4mm/in. So
28lbf/in^{2} x 4.448N/lbf x (1in/25.4mm)^{2} x (1000mm/m)^{2} = 193000 N/m^{2}
If you happen to know that 1N = .2248lbf, then
28lbf/in^{2} x 1N/.2248lbf x (39.37in/m)^{2} = 193000 N/m^{2}
If you don’t use units, you really don’t know what you are doing.