Maximizing heat absorption through Radiation
Hi All, I am currently investigating a method of absorbing heat from radiation. This is being done to harness heat from skin. I was wondering what was the best method to do this? Is there a particular...
View ArticleMelting Ice in Seawater
Using a 30kg cubic block Ice at -20degC, I want to cool down a piece of steel which is resting on the seabed. The mass of steel is 1kg and the ice block is place on top of the steel. The current sea...
View ArticleDetermining colour from
Suppose I have a picture of a flame, or some other blackish-body like emitter, and I can see that the RGB value of a part of the flame is [106, 216, 177]. How would I go about determining the...
View ArticleAC Circuit
Recently, I've been studying AC circuits and have developed a couple questions. I think I worked out an answer to the first, but I don't know about the second. First, since light bulbs in houses are...
View ArticlePower of a thrust to maintain an extended spring
Hi, I have a question about working out the power to maintain equilibrium with a spring: I attach a rocket to a horizontal spring and fire the rocket horizontally. This is done on a track or something...
View ArticleLight Reflection and Feynmans plane of oscillating charges
In ch 30-7 of the Lectures, Feynman explains that the field of a plane of oscillating charges at a point P is proportional to the velocity of the charges, considered at the appropriate retarded time...
View ArticleHelp me understand Electro-induction
Imagine you have a cylindrical dielectric charged with 100KV on one end and -100KV on the other end. Now take an uncharged metal ball and bring it close to the positive end of the dielectric. From what...
View ArticleElectric field of a line charge with the divergence theorem
Hi, on page 63 of David J. Griffiths' "Introduction to Electrodynamics" he calculates the electric field at a point z above a line charge (with a finite length L) using the electric field in integral...
View ArticleClik here to view.
Pulley problem (Two masses acting on a third body)
First off,I would like to apologise for not introducing myself. I have yet to find that certain part of the forum,but if the mistake was on my part,mods please direct me. Now to go to the real issue....
View ArticleWhat is the nature of a uniform electric field?
Also, if a particle is travelling through a uniform electric field, does anything change as it leaves the field if the electric field strength increases? If you're asked to find the magnitude, is it...
View ArticlePrimacy of conservation laws
Hello, I am hoping for some input concerning shall we say the philosophy of mechanics, particularly with relation to the concept of force. Most text books treat force as being something of a primary...
View ArticleEntropy: Heat addition to surrounding.
If 12007 kJ of heat is lost to the surroundings with an ambient temperature of 25 degrees centigrade during a cooling process, and the ambient temperature of the surroundings is unaffected by the heat...
View Articlea question on flux, and on field integration
hey all, i've recently started studying electrostatics, and i have couple of question about things that i did not fully understand, and would very much appreciate if someone could set me straight. 1)...
View ArticleClik here to view.
Thermodynamic - water/ice piston help !
An inventor proposes to make a heat engine using water/ice as the working substance inside a cylindrical piston and taking advantage of the fact that water expands as it freezes and can therefore lift...
View ArticleCreating a magnetic field (vector field)
Hi all, I have a question for all of you. I've been wanting to make a 3D vector field that would represent a magnetic field (for fun) around some segment of wire with a constant current flowing through...
View Articlequartz crystal oscillator
Quartz crystals are used in clocks to regulate time measurement. Does a quartz crystal convert heat energy to AC electrical energy? Duordi
View ArticleClik here to view.
Theory of Systems of Rays question
Hello everyone. I'm looking through an old book on optics and something there has me really confused. I attached the two pages I'm referring to, or you can find them here:...
View ArticleWrote general equation for a free body diagram
So I derived this equation for the net force/acceleration of a motorcycle on a flat surface. I beleive this equation could practically be used for any rolling object. ƩF = Fp - μ*Fn - FD Where: FP is...
View Articlegravitational constant
Hey, I have got some guestions, when I philosophized with me friends... We have classic gravitational constant, say G... And now, constant is 2G, 5G or 100G... (increases). Others constants and physics...
View ArticleSignificance of Gravitational force
Hello friends ! I got confused in the point that how can a body exert a gravitational force on other body without coming in its physical contact ? Also please explain its mechanism or significance of...
View Article