can someone explain me why f=ma ?
hey guys i had a doubt can someone please explain me why force=mass x acceleration?
View ArticleBTU rating of Earth below frost line
Does anyone know how many BTU's the Earth is capable of transferring per minute or hour per square foot of surface area below the frost line? thanks -Steve
View ArticleCan someone explain to me why E is constant?
If an electrostatic field is parallel to the z-direction everywhere in some volume why is it that the field is constant without a charge in the volume? Is this because [itex]\nabla\cdot E = 0[/itex]...
View ArticleHow are nodes and antinodes added to harmonics of open air columns?
Hi everyone! I was reading up on sound waves and I got to the point where this website was describing how instruments produce standing waves through the interference of different frequencies but then...
View ArticleRecharging Electric Cars?
Just out of curiosity, electric cars produce movement through converting electrical energy into kinetic via magnetic field and magnets, etc; would it not be possible to convert the kinetic energy back...
View ArticleHow do unpolarized sunglasses reduce brightness?
Hi everyone! I've been reading up on light and transmission, absorption and reflection and I was wondering how unpolarized sunglasses are able to reduce brightness. I tried Google-ing this but all I...
View Articlequestion regarding biot savart law and magnetic fields from current
say you have a very very long (or infinite) straight wire the carried a charge (glued to the wire) and the wire moves forward with speed v with respect to reference frame S, this creates a current,...
View ArticleDirection of propagation of an EM wave
I'm reading my course book on ELectromagnetism and it is talking about a wave moving in the y-z plane but with polarisation in the x-direction, and it says that the equation $$\mathbf{E}=E_0 2i sin(k_0...
View ArticlePotential difference on complex circuits
****WARNING-THIS IS NOT A HOMEWORK-WARNING**** Hello dear Physics Forums users, I have no idea about how to find the potential difference between two points in a complex circuit. I m not even sure if I...
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force on bottles
If we act with force on bottle in two different way, we get two results: a) If push(with hand) bottle at upper side of it, it will fall down(go to horizontal position),but if we b) push bottle with the...
View ArticleModeling the dynamics of a unit mass sliding down the curve 'y = f(x)' under...
For a unit mass sliding down the stationary curve [itex]y = f(x)[/itex] at the point [itex](x, y)[/itex], we can consider our mass to be sliding down a stationary inclined plane which is tangential to...
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Hooke's Law
Do you see where it says m(dv/dt)v = (d/dt)(.5mv^2) If it's an integration which I don't think it is then I would think it should be (d/dt)((mv^3)/3) because you're taking the two v's and adding an...
View ArticleReaction force of freely rotating rod
Hi guys! I'm working some problems for our exam in a few weeks and there are a few problems we are unable to solve. One of them is: "A homogenous rod is free to rotate without friction around one of...
View ArticlePhotons coming from atoms, when electron changes levels
Today I did the usual thinking, watched some courses online etc. and found out(or rather reminded myself) that the EM waves can be produced only when a charge oscillates.(or thats what the professor at...
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Electric field intensity inside parallel-plate capacitor filled with water
First, Id like to say that this is not homework, but my research work. Ill be very appreciated if someone could help me to address this issue, many thanks in advance. My experimental purpose is to...
View ArticleIdeal Gas in Piston (Constant Pressure vs Rate of collision)
A syringe contains ideal gas. The piston is frictionless and no gas escapes. Once heated slowly, the piston moves outwards. The piston stops moving when the temperature is steady. The pressure of the...
View ArticleWind chill: how to calculate? Is there such thing as wind "warmth"?
If it is really hot outside, and the air were warmer than your skin, would you feel warmer when it blows on you? Would there still be some sort of chilling effecT? I'm guessing it's like basic...
View Articlevector calculus questions in electrodynamics
im reading introduction to electrodynmics by griffiths, the math techniques used is sloppy to the point of frustration. hence i have several problems with the math while reading the text 1) it...
View ArticleFinding impact force on Steel ball drop test
I am doing a simple steel ball drop test on glass to see if the glass passes the standards. We are dropping 1.18 inches (0.535kg) steel ball at the height of 51inches (1.295m). Now, I can calculate...
View ArticleCalculation of Spin of Ball in Table Tennis
Hi ! I am working on the modelling of the Table Tennis game. Can I calculate the Spin of the Ball after hitting without using any camera and any vision system. I know the velocity of the ball before...
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