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What's that one where he drinks a cup of tea, where the teacup is cut in half, but the tea stays in - how do they do that?
Who?What's that scene where he drinks a cup of tea, where the teacup is cut in half, but the tea stays in - how do they do that?
AhhWilly Wonka, it's a scene in the film. Sorry.
What's that scene where he drinks a cup of tea, where the teacup is cut in half, but the tea stays in - how do they do that?
In 1970 something?
What's a gravity well?
If I drop a bucket in, how much gravity will I draw up?
Is there a way to soften water at home?
I noticed that myself actually. The rubber-sheet model only works because a mass is pulled down by gravity, creating the indentation.Does this make any sense:
"The usual demonstration using heavy steel balls on a rubber sheet to represent gravity wells relies on gravity as its own explanation!"
An imaginary 'dip' in space. If you imagine space as a flat sheet, then a massive object will create a dent in that sheet. This dent is the gravity well. It's an important concept because, like real wells (or valleys, etc), you need energy to go 'up' the sides. And conversely, you're compelled to slide down to the bottom.What's a gravity well?
Three litres.If I drop a bucket in, how much gravity will I draw up?
Beat it with a rock until it's tenderised.Is there a way to soften water at home?
Boiling water will not make is softer. You would have to install a water softener, usually ion exchange. Takes out the calcium for sodium.
from wikeh said:Temporary hardness is caused by a combination of calcium ions and bicarbonate ions in the water. It can be removed by boiling the water or by the addition of lime (calcium hydroxide). Boiling promotes the formation of carbonate from the bicarbonate and precipitates calcium carbonate out of solution, leaving water that is softer upon cooling.
We could only imagine this sheet if we imagined gravity pulling down on the object to create the dent in the sheet.An imaginary 'dip' in space. If you imagine space as a flat sheet, then a massive object will create a dent in that sheet.
That's because gravity is acting upon us independently of the well.This dent is the gravity well. It's an important concept because, like real wells (or valleys, etc), you need energy to go 'up' the sides. And conversely, you're compelled to slide down to the bottom.
So the earth is in the gravity well of the universe, and we are in the gravity well of the earth.Earth's gravity well pulls us into the centre (i.e., the middle of the Earth), much as a sledge slides down a snowy hill.
That's one reason I don't like the allegory (get it? allegory) of the rubber sheet. Simply because those who don't understand that it's an allegory don't get itWe could only imagine this sheet if we imagined gravity pulling down on the object to create the dent in the sheet.
Well, it's not my fault. It's the rubber sheet's fault. I'm just trying to make sense of it.That's one reason I don't like the allegory (get it? allegory) of the rubber sheet. Simply because those who don't understand that it's an allegory don't get it
Therefore the rubber sheet explanation fails (although I understand it, and get it)
Your thinking is one-dimensional
You are only thinking of "down" (possibly due to to the simplistic picture of the rubber sheet allegory, therefore possibly thinking that gravity is pulling the planet "down") regarding the rubber sheet allegory, and in so thinking, you are not thinking correctly.
Is this supposed to be an improvement?Think "up" and "sideways" gravity wells at the same time as the "down" well, and you might just start to get it
No thanks. I'm confused enough already.(just as an introduction. I could go on....but just for now, try to grasp that concept, it's not that hard)
The marble would also be pushed in the direction of the water flow. Is that the direction we are all going?Is the better way of visualising it to think of say water flowing round a marble? There'll be a little shell of disturbance around a spherical object.
The marble would also be pushed in the direction of the water flow. Is that the direction we are all going?
Or are you talking about water flowing from all directions onto the marble?
This would require water flowing down onto the top of the marble, and water flowing up onto the bottom of the marble.
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