Finding the right material!
As you know,the set of light wavelengths that a material is transparent to,is sth dependent on the properties of the material.My question is,can we find a material which is transparent to a specific...
View ArticleIncreasing amperage in simple circuit
I am currently in an engineering project which is attempting to hook up some solar panels to run an irrigation pump. Right now, the pump that we have is a marine Bilge pump that says that at 12 Volts...
View ArticleThermal radiation and emission spectra
I have some questions regarding thermal radiation spectra of different objects. Is thermal radiation of objects due to electromagnetic radiation alone? Does my desk which is at room temperature emit as...
View ArticleWhere can I find example problems and solutions for intro college lvl
physics? I need practice and would like to know if I even do the problems correctly so I would like to know some sites that can provide me problems with solutions. Mainly for college level classical...
View ArticleAiry disk and resolution in confocal microscopy
Hi all, I have a question about airy patterns and how these determine resolution in images. So to increase resolution the airy pattern should be made smaller. In microscopy this is achieved by using...
View ArticleA Curious Question about LCD Display
Hello, I have observed that if by chance a hair strand manages to cling to LCD Screen like TV or laptop screen, a small region near the hairline shows chromatic abberation. Is it due to some...
View Articleproof of faraday's law
Hi, I'm looking for a proof of faraday's law. This is the only page which gives a formal proof of it, but I do not understand the transformation from the first to the second step. It someone could help...
View ArticleWhat's different on electron level when voltage is higher?
I'm trying to form a mental image what's happening with the electrons when you think of the following equation: ---- Power = volts*amperes volts = joules/coulomb amperes = coulomb/second ---- Amperes I...
View ArticleWhen currents can be added?
In DC circuit currents can be added if they meet at some point, but in AC current in resistor, inductor and capacitor differs, becase they are out of phase, can they be added?
View ArticleWhy is entropy a driving force for a reaction
I understand the Gibbs Free Energy equation that was drilled into us in Chemistry class but not even my teacher could explain what entropy had to do with free energy, and furthermore, why entropy is a...
View ArticleWhat is the relationship between generator output and RPM?
First of all, if you have a generator with an open circuit, and you are pedal powering it, where does the energy go? I would say it is lost as heat, but not sure what could heat up. The coils in the...
View Articlegrain size and cross section!
Hey everyone, So I've been killing myself trying to find a good reference that talks about the wavelength dependence of dust grains when the size of the grain is about the size of the incoming light,...
View ArticleQuestion about precession in the case of frisbees
So, I was trying to figure out the physics of frisbees. When you throw a frisbee at the ground at an angle (such that the side to the left of you, assuming you are right handed, hits the ground first),...
View Articlesimple statics question
why is it when you stack two blocks on each other that the top box with mass [itex]M_t[/itex] has a normal force of [itex]M_t[/itex] and a gravity force [itex]M_t*g[/itex]where as the bottom box has a...
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Accelerometer and calculating position, angle,time
I am working on a project where we will use a 3-axis accelerometer on the door and using the ax, ay, az data to calculate position and angle of the door. The accelerometer will be positioned near...
View ArticleWhat Changes If i Place two magnets together??
Hello everybody, i wanted to ask what changes when i unite two magnets ?? except from the dimensions does magnetic moment, Br change? Thanx in advance!
View ArticleIs the laser perfect monochromatic light source?
Is the laser perfect monochromatic light source?
View ArticleShallow water wave approximation
I'm working through a solved problem in a fluid mechanics textbook. In it, the group velocity of a dispersive wave is calculated as: $$c_g = \frac{1}{2}c\left (1 + 2kh\ \text{cosech} (2kh) \right)$$...
View ArticleWhat energy is this? Related to monoatomic ideal gas
For a monoatomic ideal gas, if ##c_v## is constant then the internal energy is worth ##U=\frac{3nRT}{2}##. This is a state equation. From the fundamental equation ##S(U,V,n)= \frac {nS_0}{n_0}+nR \ln...
View ArticleCan Magnetic Force Do Work?
I am revisiting a topic discussed in earlier threads, because I feel the answers given there are either incomprehensible or mistaken (or both). It is well known that the force generated by a magnetic...
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