00:01
So in this problem, we have two identical cups of water, and there's an object in one which has displaced some water over the rim.
00:10
But we see that the two scales they're on read the same mass.
00:15
So from that, we can directly see that the answer is c.
00:19
The weight of the water displaced is equal to the weight of the object.
00:50
This is called archimedes principle, and what we can do is we can calculate that the buoyant force is equal to.
00:59
The density times the volume times exertion to gravity.
01:03
There's a negative sign here to fix a sign due to gravity.
01:07
And in this case, because the object is floating, it's not moving.
01:11
The buoyant force upward is equal to the weight of the object downwards.
01:17
And so the overall object is sitting there still...