Question

how do i convert 1.46e6 lbm/in^2 to lnf/in^2?

Answer 1

what do lbm and lnf stand for?

Answer 2

when you know the ratio of one to the other then its just a matter of division

Answer 3

lbm = like constant weight
lbf = weight with force added to it by gravety
lbf/in^2 = psi

Answer 4

if, 1 lbm = K lnf then
\[\frac{a~\cancel{lbm}}{in^2}*\frac{K~lnf}{\cancel{lbm}}=\frac{aK~lnf}{in^2}\]

Answer 5

constant weight, you mean mass?

Answer 6

yeah

Answer 7

i feel like im coming in at the tail end of a problem .... what was the original setup?

Answer 8

A simply supported basswood beam is 30 inches long and carries a load of 210 pounds. It has a hollow box cross-section where b = 5 inches, h = 8 inches, and t = 0.5 inches. Basswood has the following material properties: Modulus of Elasticity = 1.46x106lbm/in2 and Density = 28lbm/ft3. Determine the moment of inertia, deflection, volume, and weight of the beam.

moment of intertia is found to be 99

Answer 9

modulus of elasticity has to deal with stress; which is Force/(Cross sectional Area) right?

Answer 10

yes

Answer 11

and density is mass per volume

Answer 12

Yes

Answer 13

would i just multiply by 32.2?

Answer 14

well, Force = mass x acceleration; so mass X g would be my idea as well

Answer 15

28lb = mass x 32.2

mass = 28/32.2

Answer 16

lb is a force already, so to define mass we would have to divide out the acceleration

Answer 17

when i use the equation to solve for deflection, i am not able to get the correct answer using the elasticity value

Answer 18

what is the deflection formula? it been awhile since physics :)

Answer 19

(PL^3)/(48EI)

Answer 20

lol, this doesnt really help work out the theory, but it seems to be a calculator for deflection. im out of time at the library so i gotta head out

http://www.botlanta.org/converters/dale-calc/bending.html

Answer 21

alright thanks for your help