How much does a 2 x 4 x 8' board weigh?

Answer 1

That depends on the density of the board. I can tell you this much: the board's volume is 2*4*8ft, which is 64ft. Feet aren't generally a unit of volume; the fact that they are in this case shows that the board is 1-dimensional. Unless you meant to give the rest of the numbers apostrophes as well, in which case the board's volume is 2ft*4ft*8ft, which is 64ft3. Anyway, from that point, you'll need the density to figure out the mass, which you'll need to figure out the weight. That brings up another question: are you talking about weight on Earth? Mehh, you probably are.