Explain the phenomenon in terms of force/geometry:
When a cup containing beer stands stilld on a slope, the surface of beer is parallel to the horizontal.
If the cup is sliding down along a slope at a uniform speed, the surface of the beer is parallel to the slope instead of being parallel to the horizontal.
I wonder if anyone can explain in terms of force.
The cup can be considered as an isolated inertial system. Why the liquid surface in moving cup is differ from that at rest.
The answer with the highest quality would be chosen, not by time. I will read this page regularly. treasure:40pts
inertia
2008-04-19 7:00 am
回答 (3)
2008-04-23 8:34 am
✔ 最佳答案
Just for advice, but not answer...I think we can explain it in terms of Pressure
Pressure=Force/Area
For the first situation, there is pressure difference between beer molecule.
So there is Force to make beer surface parallel.
For the second situation, should we use Bernoulli's Principle?
參考: Myself
2008-04-24 4:54 pm
CE tutor MC CHAN's nots
I'm not sure if he's 100% correct.
Those tutor are making lots of mistakes in their marking scheme of mock paper.
I'm not sure if he's 100% correct.
Those tutor are making lots of mistakes in their marking scheme of mock paper.
2008-04-23 4:14 pm
I don't think your statement is valid. If the cup is sliding down along a slope at a uniform speed, the surface of the beer is still kept HORIZONTAL. Only when the cup is sliding down the slope at an ACCELERATING speed, the surface of the liquid will be tilted.
2008-04-23 08:15:06 補充：
Even in this case, the surface may not be parallel to the slope. It is parallel to the slope only at a certain acceleration. I wonder where you got your information.
2008-04-23 08:15:06 補充：
Even in this case, the surface may not be parallel to the slope. It is parallel to the slope only at a certain acceleration. I wonder where you got your information.
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