Search
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 induc...
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...
Why can these Single Vision lenses slow myopia for kids, but not adults? Kids' eyeballs are still growing, so there is opportunity to steer them into growing to a less myopic final result.
This site is not for five year olds. We are not kindergarten teachers. Asking a bunch of volunteers on the internet to explain physics to a five year old is a waste of time. Explanations at that...
My opinion is that such qualifiers, especially when combined with very general questions about specialized subjects, are not helpful. Generally, the tone of the question will be indicative of the ...
Several questions have been posted recently where the user asking the question points to an extremely limited knowledge of the relevant field by asking of others to "explain like I'm five" (years o...
These WorldFamous companies advertise that their lenses can control myopia for kids, NOT adults. But none of these lenses are approved by FDA. I asked my optometrist why merely kids, not adults. Bu...
All refractive lenses are approximations of the ideal. This is particularly the case of single-element lenses such as in eyeglasses. It so happens that the centers of such lenses are closer appro...
My optometrist said that round eyeglass lenses are OPTICALLY better than rectangular, particularly to correct myopia. He was NOT referring to fashion or style. I couldn't understand his explanatio...
With time dilation a cosmonaut could travel forth in time, especially in light speed. But are there much lesser speeds which might be achievable by humans in the next 100 years which could also in...
The light shines on everything in an unblocked direct line from the light source. This light is quite bright, so can be seen by human eyes all the way out to the horizon (until the curvature of th...
It counters intuition that although a light fails to illumine the area between the source and the target, the light can still illumine SOLELY the target! The light is illuminating everything. The...
I never grokked the optics behind LightHouses and the WW2 poster below work. LightHouse beams are narrow and focussed. Doubtless, the light source can fail to illumine a seafarer or the enemy subm...
Please see below screenshot of 15:59.The LED spot light (fastened to the front of the boat) illumines merely a few meters in front, and fails to illumine most of the water between the boat and the...
Kinetic energy of any particle (who has mass) is $$T=\frac{1}{2} m\ddot{x}^2$$ OP had took potential as potential energy, that was wrong. $$U=-\int \vec F\cdot d\vec l $$ For the case, The forc...
The "R value" of insulation is its thermal resistance. It tells you how much of a temperature difference is required to transfer a certain amount of heat power per unit area. The R-value you see ...
I'm interested in knowing the surface temperature of both sides of a double-pane or triple-pane window. Given the R-value of the window, and the air temps outside and inside, how can I calculate t...
I want to write some code to control my whole house humidifier. I want my code to calculate the percentile relative humidity above which dew will form on my windows. I have sensors for air tempera...
I was looking for book on classical thermodynamics. I found lot of related posts in PSE but couldn't find a book which type I was expecting. I was searching for book which covers the whole thermody...
We don't know the details of your setup, but most likely there was a partially reflective surface over the actual photoresistor. The photoresistor itself may also be partially reflective. A highe...
In the lab I changed the angle the light hits a photoresistor and it doesnt obey Lambert's cosine law the conductivity of the photoresistor drops fast from +-20 to +-30 degrees angle.Why?
One way this can be explained is from the perspective of numerically approximating an integral. From this perspective, the concordance of "continuous" and "low frequency" has to do with the low fre...
The Rayleigh-Jeans law does a good job of describing the spectral radiance of a black body at low frequencies: $$B_{\nu}(T)=\frac{2kT\nu^2}{c^2}$$ with $T$ the temperature and $\nu$ the frequency...
Scientists rarely rule anything out completely. That said, I expect it to be highly unlikely. Recall that Pluto was hypothesized in the late 1800s as the source of perturbations observed in the or...
May it be that there are more than 8/9 planets in our solar system which aren't detectable with the current technologies? Is there any theory suggesting that our solar system has more planets, all...
