Will the plane take off

[Big Tone]

When are you going to tell us the answer?

Here here! (Or is it hear hear? )

Come on old chap, we're in suspenders. I showed people at work who keep asking me have I got the answer and reason yet.

 

[JBR]

When are you going to tell us the answer?

Here here! (Or is it hear hear? )

Come on old chap, we're in suspenders. I showed people at work who keep asking me have I got the answer and reason yet.

Since you ask, it's 'hear hear'. Apparently, MPs (and presumably other people) used the expression to persuade colleagues to listen to (hear) a speaker with whom they particularly agreed.

 

[Big Tone]

Okay ta. I particularly agree with you What do I say to RH? 'deaf deaf' or 'mute mute'

 

[RogueHanger]

Okay ta. I particularly agree with you What do I say to RH? 'deaf deaf' or 'mute mute'

If I permeate your every thought that much, perhaps you need excorcising.

 

[empip]

Ha ha, f##ked are we ? So muddy the clear waters.

-0-

 

[Big Tone]

I found RH's take interesting and intellectual, and I'd like to agree more with him but he'd just mock me for switching. So if he makes a good point, I darent say. It's that and the political speak that finally got up my nose.

Well, and incessantly bringing everything back to racism. I don't even want to hear about motorbikes that much, which I love. There's just no 'off' switch; an almost Jack in the box aspurgers quality that pops up the second you say anything.

I'll switch ignore off for a week and see if he's still at it...

P.S. My mate did the 1/4 mile at Santa Pod the weekend on his Busa. 141mph in 10.24 seconds.

 

[EddieM]

Balls...... right hand side goes down with considerable force, just simplified it, took a glass of water, put it on the scales, then held an object in the glass, weight went up considerably...

Now I just need to understand why..... pffftt!! I was wrong..... again!

 

[WalksWithTurkeys]

Just a rethink.
The weight of the steel ball is taken by that frame it's suspended from.
The Ping pong ball excerts force on the water but it's mass and that of the string is supported by the water thus making the left hand flask slightly heavier , assuming identical masses of water . Wether the ball is in the position shown or simply floating on the surface it adds it's mass to the left hand side thus that side should tip down a bit.

That is my reasoning too. The right hand flask might also be lightened a tiny amount by surface tension between the water and the ball.

 

[cajar]

I found RH's take interesting and intellectual, and I'd like to agree more with him but he'd just mock me for switching. So if he makes a good point, I darent say. It's that and the political speak that finally got up my nose.

Well, and incessantly bringing everything back to racism. I don't even want to hear about motorbikes that much, which I love. There's just no 'off' switch; an almost Jack in the box aspurgers quality that pops up the second you say anything.

I'll switch ignore off for a week and see if he's still at it...

P.S. My mate did the 1/4 mile at Santa Pod the weekend on his Busa. 141mph in 10.24 seconds.

AronSearle's currently ragdolling him around on the other thread, where RH's inability to respond to Aron's logical, succinct argument with anything except with accusations of insults/closemindedness/abuse betrays a serious lack of intelligence. Sorry to disappoint, Tone.

 

[Big Tone]

I know Cajar. Have re-joined, un-ignored him, to see if it ends the same as my experience...

But back to this thread. I've concluded it is one of three things.

 

[ladylola]

Just a rethink.
The weight of the steel ball is taken by that frame it's suspended from.
The Ping pong ball excerts force on the water but it's mass and that of the string is supported by the water thus making the left hand flask slightly heavier , assuming identical masses of water . Wether the ball is in the position shown or simply floating on the surface it adds it's mass to the left hand side thus that side should tip down a bit.

That is my reasoning too. The right hand flask might also be lightened a tiny amount by surface tension between the water and the ball.

Hmmm , however having seen the video I can see that I was wrong and can now understand why so my third answer is that the right hand side goes down.

 

[JBR]

Okay ta. I particularly agree with you What do I say to RH? 'deaf deaf' or 'mute mute'

Might I suggest 'pi$$ off'? I believe in calling a spade a spade rather than dithering about!

 

[AronSearle]

Balls...... right hand side goes down with considerable force, just simplified it, took a glass of water, put it on the scales, then held an object in the glass, weight went up considerably...

Now I just need to understand why..... pffftt!! I was wrong..... again!

This is the correct answer.

I cant claim to understand the physics behind it, but the boyant force of the steel ball pushes it down, as the steel ball is *outside* of the system.

The boyant force of the ping pong ball is *within* the system, so does nothing.

The boyant force is greater than the weight of the string and ping pong ball.

FYI if you look at the asian guys youtube video, you will see a link in his comments to an improved (and overly long) experiment.

(Btw, what is this to do with planes taking off?)

//www.diynot.com/forums/general-discussion/conveyor-belt-and-plane-answered-at-last.333491/

 

[empip]

Nicely put.

http://memolition.com/2013/09/17/can-you-solve-this-odd-balance-challenge/

Ms SL · University of Helsinki
The arrogant certainty with which many people have posted a number of different false conclusions is quite amusing. For one thing, buoyancy is not exempt from Newton's Third Law.

To not be guilty of the same arrogance, feel free to correct my reasoning should you find any errors in it.

Let us investigate the relevant forces in the system – it may be helpful to draw a free body diagram of this:

Left beaker:
- a downward force G_water (weight of the water) on the water
- an upward buoyant force B is exerted on the table tennis ball
- a reaction force F exerted on the water by the ball, equal but opposite to the buoyant force (i.e. downward)
- a downward force G_tt on the ball (the weight of the table tennis ball)
- a downward tension force T on the ball
- an equal but opposite tension force T' on the bottom of the beaker via the string

What cancels out: the two tension forces (T & T') with each other, and the buoyant force with its reaction force (B & F)
What is left: weight of the water (G_water), weight of the ball (G_tt)

Right beaker:
- the same downward force G_water (weight of the water) on the water
- the same buoyant force B is exerted on the table tennis ball
- the same reaction force F exerted on the water (again downward)
- a downward force G_sb on the ball (the weight of the steel ball)
- an upward tension force T'' on the ball: opposite but equal to the vector sum of G_sb and B
(reaction forces to T'' are outside the system and do not act on it, so irrelevant)

What cancels out: the tension force T'' and B together cancel out the weight of the ball G_sb
What is left: weight of the water (G_water), reaction force F (equal but opposite to the buoyant force)

(I left out a number of reaction forces, which is why some of the forces canceling out each other may not be obvious. They should be easy enough to consider, though, and the end result is as described above. Just see how the different forces will eventually act on the scale.)

There is a larger force exerted on the right side of the scale (G_water + F) than on the left (G_water + G_tt), as F is obviously larger than G_tt.

Hence, the right side goes down.

And probably the most succinct :-

By anonymous.
Left side weight = water weight + weight of ping pong ball.

Right side weight = water weight + weight of a water ball with the same size as the metal ball (and thus as the ping pong ball).

Since the water ball is heavier than the ping pong ball (this is why it floats), the scale tips to the right.

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