00:02
All right, so you add some questions about buoyancy and how it relates to parent weights as well as density.
00:12
So this is all about archimedes principle, basically, that whatever the volume displaced by the object that is submerged, that volume, whatever its weight is, is equal to the buoyant force.
00:28
So whatever the weight of the water displaced by the block, i accidentally.
00:34
I made it as a sphere here, but whatever that volume is and the weight of that water is what the buoyant force will be.
00:45
So it says that the original weight of the block was 20 newtons.
00:52
That's its true weight.
00:54
And then we submerge it and it's apparent weight is fought.
00:57
So suddenly magically it's only, it's lost 15 newtons of weight.
01:02
Well, that must be the buoyant force then.
01:05
So the warrant force is 15.
01:07
And because the other scale is not outside or not inside the water has no effect on its readings.
01:15
So it still is measuring the entire system.
01:19
We've just added another 20 newton.
01:21
So we just add those two together.
01:22
That would be the scale reading on the outside.
01:24
It's 90 or 70 minutes now.
01:27
So where's this all coming from? this buoyant force is canceling out the weight of the block, at least all but five newtons of it.
01:36
So that's why the scale is reading only five newtons.
01:41
The scale is actually reading what we would call the normal force...