So I went ahead and assumed 500lbs was shell+foam+dead weight and came up with a reasonable foam density.
https://www.dropbox.com/s/hdeiscfhcjq7qb2/Prob2.xps
I assumed I would need to solve for the part+foam density ((part mass + foam mass)/(part volume + foam volume)) needed to keep 500 additional pounds of dead weight afloat, and then pull out the foam density.
I see this as unreasonable considering that this is a polymer processing class. The...
I understand all of that but having to solve for a combined object density (one polyethylene and assumed by me to be HDPE, the other of unknown mass but known volume) is really throwing me off.
Edit: I'll post my mathcad in the morning. Hopefully you guys can point out where I'm straying...
The foam density is the unknown value being solved for. I know its volume from the specifications given for the part. The problem that I'm facing now is that I need to solve for a combined part+foam density to use the Archimedes principle. I plugged all of my known values into MathCad and I...
I have a polymer processing teacher that has decided to give us a final exam with a bunch of questions we have not covered the entire semester. I've figured out most of them but this particular one has me stumped.
I am given the dimensions for a part made of a known material and need to...