Activity for MissMulan
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #287508 | Initial revision | — | almost 2 years ago |
| Question | — |
Magnetization as a function of temperature in ferromagnets Suppose a ferromagnetic material with initial magnetization $Mo$.Is there some specific formula which calculates the total magnetization $M$ as a function of $M{o}$ and the Curie temperature $T{c}$? (more) |
— | almost 2 years ago |
| Edit | Post #287450 |
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— | almost 2 years ago |
| Edit | Post #287450 | Initial revision | — | almost 2 years ago |
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Direction of vector of electric field Suppose we have a arc of charges with some charge density $\lambda(\theta) = sin\theta$.I am using polar coordinates for convenience.But how can I find the direction of the unit vector of the net electric field?In the previous example (the one with the line of charges)the direction of the net electri... (more) |
— | almost 2 years ago |
| Edit | Post #287259 | Initial revision | — | about 2 years ago |
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Maxwell equations EM wave confusion The general formula for a EM wave (solving for the E field) is:  where $\varepsilon = \varepsilon {r}+j\frac{\sigma }{\omega }$ My professor told me that the conductivity of vacuum is 0 so we eliminate the term with the $... (more) |
— | about 2 years ago |
| Edit | Post #286927 | Initial revision | — | about 2 years ago |
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maxwell equation in 1d Maxwell's first law in differential form states that $$ \triangledown \cdot E = \frac{\rho}{\epsilon{o}} $$ . In case of 1d can we say that $$\rho = \lambda$$ where $$\lambda$$ is the linear charge density of something? (more) |
— | about 2 years ago |
| Edit | Post #286925 | Initial revision | — | about 2 years ago |
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Double slit experiment with 2 electrons fired from a gun Suppose we perform the double slit experiment , but we fire instead 2 electrons instead of 1. In the double slit experiment performed in the 1920s a interference pattern was observed at the screen which showed the electron-wave nature of any subatomic particle.The particle would start moving as a ... (more) |
— | about 2 years ago |
| Edit | Post #286923 |
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— | about 2 years ago |
| Edit | Post #286923 | Initial revision | — | about 2 years ago |
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SI Units of wavefunction What are the SI units of the wavefunction Ψ(x).I know that [Ψ(x)]^2 describes the probabilty of finding a quantum object at a certain quantum state but what about the wavefunction instead? (more) |
— | about 2 years ago |
| Edit | Post #286906 |
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— | over 2 years ago |
| Edit | Post #286906 | Initial revision | — | over 2 years ago |
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Differential equation solution cannot describe what happens in reality Suppose we have a free falling object inside a planet's gravitational field with strength g.The planet's atmosphere provides a drag force which is dependant from the u^2 of the particle. Suppose the weight of the object is m1g and the drag force due to the atmosphere is -ku^2 and lets say we set k... (more) |
— | over 2 years ago |
| Edit | Post #286898 | Initial revision | — | over 2 years ago |
| Question | — |
Classical Uncertainty Suppose we are using a force gauge to measure gravity in a planet. We set the gauge force to the 1N range which has a resolution of .01 N. From its specs the error introduced during the measurment at the 1N range is 210^-3reading+10^-3range. Now suppose we perform 5 different measurements: ... (more) |
— | over 2 years ago |
| Comment | Post #286873 |
Im looking something in the newtonian mechanics region of study which is modeled by a system of ordinary differential equations. (more) |
— | over 2 years ago |
| Edit | Post #286869 | Initial revision | — | over 2 years ago |
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System of ODEs models in physics What examples of a system can be described by a system of ordinary differential equations? (more) |
— | over 2 years ago |
| Edit | Post #286842 | Initial revision | — | over 2 years ago |
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How are charges sorted? Im designing a capacitor and I have decided to make the surface of 1 plate of the capacitor bigger than the other plate. Image alt text How are the charges sorted through A2?Are they spread out to cover all the surface area of the conductor (A2)? (more) |
— | over 2 years ago |
| Edit | Post #286802 | Initial revision | — | over 2 years ago |
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Calculate inductance using laws of electromagnetism Get 2 conductors and seperate them we can use Gauss's law to calculate the capacitance created by the seperation of the 2 conductors.Can we use other laws of electromagnetism to calculate the inductance of a piece of wire just like we used Gauss's law to calculate the capacitance of the 2 seperated c... (more) |
— | over 2 years ago |
| Edit | Post #286695 | Question closed | — | over 2 years ago |
| Edit | Post #286695 | Initial revision | — | over 2 years ago |
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Meaning of complex frequency If we have a LC high pass filter the transfer function H(s) becomes: $$ H(s) = \cfrac{sL}{sL + \cfrac{1}{sC}} $$ If we solve for s to find a pole of the transfer function we get: $$ s = j \cfrac{1}{\sqrt{LC}} $$ In the case of a sinusoidal input signal = $ s = j \omega \rightarrow \omega ... (more) |
— | over 2 years ago |
| Edit | Post #285688 | Initial revision | — | almost 3 years ago |
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Conductivity with angle of light In the lab I changed the angle the light hits a photoresistor and it doesnt obey Lambert's cosine law the conductivity of the photoresistor drops fast from +-20 to +-30 degrees angle.Why? (more) |
— | almost 3 years ago |
| Edit | Post #284165 | Initial revision | — | about 3 years ago |
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A: Is it plausible to desire a "universal" calendar applicable everywhere in our universe? I dont think anyone can make a universal calendar because time flows more slowly or more fast between different regions in the universe or it can even go backwards if you come close to a rotating black hole. And a planck unit of time is not the smallest amount of time ,the planck time is defined a... (more) |
— | about 3 years ago |
| Edit | Post #283743 | Initial revision | — | about 3 years ago |
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Superconductivity In my notes from University the reason a material can exhibit superconducting properties is at really low temperatures electrons form Cooper pairs of which the electrons of the Cooper pairs have lower energy than if they were in the conduction band so which means that they dont collisions with the ca... (more) |
— | about 3 years ago |
| Comment | Post #283395 |
@#8056ts we should make this a new question. (more) |
— | over 3 years ago |
| Comment | Post #283395 |
@#8056ts we should make this a new question. (more) |
— | over 3 years ago |
| Comment | Post #283395 |
Olin photons can't accelerate like most of the objects because photons always move with one speed for all inertial frames. (more) |
— | over 3 years ago |
| Comment | Post #283393 |
But how can we find x(t) from F(r) since they have different arguments? (more) |
— | over 3 years ago |
| Edit | Post #283392 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Why we can't find a particle accelerating unless there's some other particle accelerating somewhere else? > But, when we are walking, running. We are accelerating. Wrong.When you are walking you're moving at a costant speed. > The third law says we will never find a particle accelerating unless there’s some other particle accelerating somewhere else The book says that because of Netwon's 3r... (more) |
— | over 3 years ago |
| Edit | Post #283386 | Initial revision | — | over 3 years ago |
| Question | — |
How to find position of a particle at a time given a position dependent force If we have a force which changes depending on the position of a particle, how can we find the position of the particle at some time $t$? We can find its velocity if it has travelled a given distance $$ \int^{rf}{ro} F(r)dr = \frac{1}{2} \cdot mp(uf^2 - uo^2) $$ but this equation doesn't inv... (more) |
— | over 3 years ago |
| Edit | Post #283009 |
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— | over 3 years ago |
| Edit | Post #283251 |
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— | over 3 years ago |
| Edit | Post #283251 |
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— | over 3 years ago |
| Comment | Post #283251 |
I will edit the question then (more) |
— | over 3 years ago |
| Comment | Post #283251 |
It is an exercise the gravitational field exists only for some r below a limit and a test particle enters somehow(pops into existence) at the edge of the field. (more) |
— | over 3 years ago |
| Comment | Post #283251 |
It is a exercise it is not the real deal. The gravitational field only exists for some r below a limit. (more) |
— | over 3 years ago |
| Comment | Post #283009 |
I am assuming for simplicity the B field becomes 0 after the particle reaches the end of the wire. (more) |
— | over 3 years ago |