2006-10-14 05:17:47 · 5 answers · asked by jdtree 1 in Science & Mathematics ➔ Physics
about 210kg mass assuming that the added mass is a lot denser than whatever it is displacing, that the plastic barrel itself has about the same density as the water that it displaces, that the drum didn't collapse when you emptied all the air out of it or when you submerged it. also assumes US Gallons - if UK gallons then about 250kg.
2006-10-14 05:38:14 · answer #1 · answered by Anonymous · 0⤊ 0⤋
This problem concerns Archimedes Principle which states that a body submerged in a liquid is acted upon by a bouyant force equal to the weight of the volume of liquid displaced. The 55-gal drum, assuming its weight is negligible, needs to be pushed down the water to submerge it completely, with a force equal to the bouyant force acting upwards on it. That downward force is equal to 55 gal multiplied by the density of water.
In my days we used 62.4 lb/ cuft as the density of water. Nowadays maybe you might have to convert this to kg/m^3 or Newton/m^3. That wouldn't be too difficult for you to do, would it? But if lb as a measure of weight is acceptable, then just convert 55 gal to cubic ft and multiply the resulting figure by 62.4. The product is the weight in lb which you are looking for.
Sorry I don't have the conversion table for gal to cubic feet in front of me, but I hope you can look for that yourself.
2006-10-14 13:21:16 · answer #2 · answered by tul b 3 · 1⤊ 0⤋
Not so much, since the drum will collapse when you start submerging it.
2006-10-14 16:51:29 · answer #3 · answered by Nomadd 7 · 0⤊ 0⤋
depends in which river you are dumping it in, but about a 165lb body will do it
2006-10-14 12:20:30 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Wutcha up to?
2006-10-14 13:49:21 · answer #5 · answered by Dr. R 7 · 0⤊ 0⤋