The propagation in a medium is governed by a differential equation. Good basis functions turn out to be solutions to that differential equation. In most cases, the differential equations are second order due to the laws of motion*. Hence, the popularity of forms similar to exp(kr-iwt).
* You...
As previously mentioned, the De Broglie wavelength is just a hand-waving rule of thumb that was developed at the beginning of quantum science. But it is still very useful in getting an intuitive feeling for what is happening. How it fits into the 3D Gaussian can be thought of in the following...
The Sun's fusion has many interesting characteristics. Such as, the core only produces 276 W/m^3, which is about the same as a compost heap! The fusion in the Sun is very slow, which is nice because it afforded life the opportunity to evolve. The key limiting step there is the creation of...
So, the formula that holds for all a is:
F = |mg-ma|/us - the absolute value of the resultant force is what matters to figure out the friction.
As an aside, since most elevators are suspended with cables, you might find that it is very difficult to make the elevator accelerate downward with...
Your reasoning is substantially correct. However, let me ask you this: When you drew your diagram, you made "mg" point down (ok!) and you made curly-f=ma point up (also ok!). Since they point in opposite directions, what does that say to you about your equation? How would you correct it?
An airplane was becoming more and more unstable. It got so bad that the steward got on the PA system and asked if there were any pilots on board to help the crew. An electrical engineer volunteered. He went to the front of the cabin, and then asked if there were any Polish people on the...
Or better, a short chain or rope connecting to the two pulling eyes, that is long enough so it is hanging slack. Then everybody can see that the chain is not doing anything when the hemispheres are together. And if they do separate, the slack chain will only allow a short movement.
Annamal,
You need to slow down and do your maths correctly.
For example, let's consider circuit a. The impedance of a series circuit is the sum of the impedances.
So, Z = -j/(wC) + jwL. We set Z=0, do some algebra and get w = 1/sqrt(LC). That'd the frequency where the impedance is zero (a...
One aspect of these spinner weapons is that they apply a similar terrible force to your own robot. Unless you can make the point of weapon contact be at the center of gyration, you will get a strong kick-back. Just like when you hit a baseball incorrectly with the bat - it stings your hands...
This is a voltage divider problem. The impedances for the U2 circuit are 1 kOhm + 100 mHenry. The 100 mH is in common with the U1 circuit. Hence, the interference voltage Ui = U2 * (j w .1) / (1000 + j w 0.1). w in this case is 2 * pi * 1e6 Hz. Note the Ui you will get from this is a complex...
Evaporating large amounts of N2 using air as the heat source raises a couple of issues. 1) You will create a lot of condensation (frost), and this will make your cart and its contents wet. Could be a problem. 2) In the extreme, you might get some collection of liquid O2 (it boils at a higher...
Iron II Oxide. It is the black coating that you find on steel fasteners. Very stable at high temperatures. Can turn into red rust if you let it get wet. But the high temps will roast it back to black.
Since the sample is contained in this magic immutable container, we will have to use extraordinary measures. I would pass a beam of neutrons through the container (block that, magic container!). While passing through the material, the neutrons would reach equilibrium with the material. Then I...
Dibbsy: Your lack of linguistic rigor suggests to me that you are not ready for physics. You use words and equations without understanding or definition. You will never get anywhere doing that.
As to your question, you ask about "damage". What is damage? How do I measure "damage". Until you...