A friend of mine can NOT grasp this scenario... Imagine there are 2 large lakes, with a Bridge
that is carrying water between the 2 lakes, like a large Aquaduct, with a tunneled road with
vertical piers underneath the 'Bridge'. (A 'road' goes under the water 'Bridge')......
Now imagine that in one of the lakes, there is a 20,000 Ton tanker/ship, that is moving to the
other lake. At one point, it is now stopped exactly in the middle of the 'water' bridge, with only
1-cm clearance on the sides & bottom. Is there ANY extra weight on the Bridge??? NOPE!!
When the 'ship' was 1st put in the 1st lake, the water level had risen slightly across both lakes,
and the bridge. And a Floating Body displaces it's Own weight in water... So while being placed
on top of the bridge, it's water displacement is exactly equal to it's own weight....
So there is NO increase of weight on the bridge !!! Physics 101 haha...