It is mostly adviced to switch of your cell phones at refill stations.
(I have seen it being discouraged in newspaper adverts)
I don't believe its a myth.
Can't agree with you more.
I had to use a potentiometer in a circuit, took me some time to procure its data sheets from the net and figure out the leads and their purposes.
[MATH]h \rho g + \frac{2 \sigma}{r} =p_{o} [/MATH]
h is height of water column
[MATH]\rho[/MATH] is water density
[MATH]\sigma[/MATH] is surface tension of water
r is radius of aperture
[MATH]p_{o}[/MATH] is outside pressure (atmospheric pressure)
g is acceleration due to gravity
Note that critical part is height of column and not total weight of water.
Assumpttions :
a) Closed bottle
b) No air present in bottle (If any then it has negligible pressure)
Of all that you have posted so far, I only agree with the fact that maths is man made.
Once you make that statement, the rest of your statements automatically become invalid. You can no longer challenge infinity, now you are in the domain of maths, and must present a mathematical proof to support each and every one of your claims.
When you get your potentiometer, be careful in the way you attach it. It would typically have 3 leads, 1 is common, 1 is adjustable the third is set to maximum resistance. Be sure not to use the lead which is already set to maximum, otherwise you'll defeat the purpose of the potentiometer.
I had massive problems in configuring my zone alarm with my connection type. So finally I decided to get rid of it and installed this very nice freeware called Sygate Personal Firewall. It works perfectly well, ever since I installed it I have had no virus attacks. Plus it has no conflict issues with any software.
You do all those calculations only if you want to use a resistance in the circuit, with a potentiometer, you just set up a voltage measuring device across your bulb and adjust your potentiometer till the voltage comes to 18V
Another nice way to appreciate difference between speed and velocity, is to analyse a particle moving in a circle with a constant speed v. Even though speed remains the same, the velocity constantly varies due to direction change.
I have a right eye dominance though my left eye is stronger (and it always has been since I got spectacles). Even I would have liked to believe there was some sort of connection between the two )
The bottle does not leak because the surface tension of the water bubble formed at the aperture is greater than the weight of the liquid column above.
If you were to take a constant hole size and keep increasing your bottle content, it will eventually leak.
To get the critical hole size, merely equate the forces at the hole interface
Though concentrated HCl and sulphuric acid don't cause too many storage problems. They can be bottled up if you wish to do so. Thtas why they are stored in high concentrations. One chemical that is notoriously hard to handle is ammonia, generally labs would store that in fume cabinets, which is why often you don't get too much conc NH3 in school labs.
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