Rhett Allain
Region: US
Wednesday 25 March 2026 12:51:41 GMT
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William :
What I love about this comment section is it shows how confident people can be in their answers even when they’re wrong. The scales will read the same.
2026-03-25 15:55:09
509
DataRaid :
YOU PART TWO’D US WITH A PHYSICS VIDEO?!?!
2026-03-26 01:55:06
911
tupulupi :
😭😭😭
2026-03-27 06:42:34
1293
PeteT :
Less than 181g by the volume of water displaced by the brass ball. Weight of the ball is irrelevant as it is suspended, only the volume is relevant. Supply the diameter of the ball for an accurate answer.
2026-03-25 14:20:01
140
YR81 :
The scale will also read 181 g. By Archimedes, the ball will exert a force of ρ V_B g downwards on the water, where ρ is water density and V_B is the ball's volume. The weight of the remaining water is ρ (V - V_B) g, where V = 120 mL. So the net downward force on the water is simply ρ V g, which must be supported (along with the beaker's mass) by the scale, so it's the same for both left and right. The force sensor on the right will read (ρ_B - ρ) V_B g, where ρ_B is the density of the ball, since it must support the weight of the ball less the buoyant force from the water. That would depend on the ball's material.
2026-03-25 13:39:41
69
Chase Baker :
The real question is why does your 120 mL of water weigh? 181 g
2026-03-26 12:20:09
12
ecocawphezj :
I can't believe everyone is getting this wrong. both scales will read 181 g.
2026-04-12 00:44:23
142
Segal :
Same weight. The beaker with the object inside has less water because the object displaces that volume. On the other side, the submerged object pushes down on the water with the buoyant force, which equals the weight of the displaced water. Those two effects cancel -> both scales read the same.
2026-03-25 21:12:48
33
MC Lehrer :
By Archimedes' principle, the water exerts an upward buoyant force on the ball equal to the weight of the displaced water. By Newton's Third Law, the ball pushes the water downward with the same force. This force is transmitted to the scale. Therefore, the scale increases by exactly the weight of the displaced water. 😁
2026-03-26 06:57:08
50
Rh :
Silly people pay attention the one on the left has 120ml the one on the right does not actually have 120ml inside the water is just displaced by the volume of the brass sphere therefore there is less than 120ml. So it will weight less
2026-03-25 23:43:05
28
natedill :
They'll weigh the same. You can entirely ignore the ball if you consider hydrostatics. Because the depth of water is the same the hydrostatic pressure (and downward force) on the bottom of the beakers is the same.
2026-03-25 23:43:37
7
dan.co.za :
it's a trick question. scales can't read
2026-05-03 06:05:17
13
Tired old man :
There is less water in the one with the brass ball so it will weigh less
2026-03-26 12:00:35
13
WTFawk1962 :
the key is that the water level reading is 120ml on both vessels but that is not the water volume in each
2026-03-26 10:35:28
8
CaptainMiz :
I’ll say both scales read the same and the orange scale will read the weight of the ball, less the weight of the water displaced.
2026-03-25 21:18:41
10
David Herberg :
It will be heavier by the difference between the weight of the ball if it weren't in the water and the weight when it is in water.
2026-03-25 20:44:53
11
Dr Aazan Khattak :
Brass has its volume but not weight, so 120ml volume water is like 90 or 100 ml the remaining 20 ml volume is filled by the brass ball but brass ball is suspended so it’s weight is not acting on the scale . In short the ball has volume contributing to the beaker but not the weight
2026-05-13 16:10:27
1
Curt & 98,332 others :
They will be the same. There is buoyant force on the ball even though it is more dense than the water. That force is pushing the ball up, which will be included in the measure of force on the scale. The force measured on the hanging scale will be less than what the ball weighs outside of the water by an amount able to be calculated if the specific gravity of both the ball and the water was given and the amount of water was shown after removing the ball.
2026-03-25 15:06:41
9
Ass HATT :
Lower. The ball displacement water, yet fill volume, while not contributing to weight. Take it out and you'll end up with less than 120ml in the beaker & less water weighs less. And the scale will read the weight of the brass ball only, since the water is less dense, so don't support the balls weight in ant way. Fun fact, 1L of water weighs exactly 1Kg
2026-05-15 19:57:57
0
Rafi Marsidek :
I know no physics, but based on conversion energy theory and thermodynamic laws with thermal equili, considering ambient temperature. Scale would be the same
2026-05-20 06:53:47
2
downtroddin :
We can’t answer cos you taped it up
2026-04-27 00:51:33
2
Big_Bi_Energy :
everyone in the comments forgetting abt buoyancy force is killing me
2026-04-23 17:21:51
4
Erin Elizabeth :
why isn't anyone asking why 120 ml of water weighs 180g
2026-03-26 05:47:00
2
MUBY :
as long as the ball has displaced water exactly 120ml so it must be 181grams.
2026-05-19 18:52:21
2
Thoraker :
It's the same, that's because the weight of the ball it's suspended by the string
2026-05-15 23:03:54
2
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