If that one-cubic-foot pumpkin should happen to weigh 70 pounds, however, it would overcome the 60 pounds of buoyancy and sink. If the one-cubic-foot pumpkin should happen to weigh, say, only 50 pounds, it will be pushed up out of the way (buoyed up) by that extra 10 pounds of force from the water. For a cubic foot of water, that amount of weight is about 60 pounds. Buy Bobbing for Watermelons by April Moore from Waterstones today Click and Collect from your local Waterstones or get FREE UK delivery on orders over £25. The only way it can do that is to push the pumpkin back up out of the way with whatever force or gravitational weight it can muster. But the water now has a pumpkin-shaped hollow in it, and the displaced water wants to flow back down, as is its gravitational habit, to fill the hole. That displaced water is necessarily pushed upward - there's no place else to go - so the water level rises. One cubic foot of water now has to get out of the way, to make room for the pumpkin. We'll completely submerge a 15-inch-diameter pumpkin, which has a volume of one cubic foot, into a huge tub of water.
0 Comments
Leave a Reply. |