question regarding 7402 ic
Hello everyone...!!!! i have made different logic gates using 7402 ic (quad 2-input nor gate ic). what actually occurs is that after joining different gates for making "and" gate & "or" gate until...
View ArticleMagnetic dipole moment energy question
Hello, I have this problem. I calculated the dipole energy of a dipole moment in an external field using the equation [itex]U_m=\frac{1}{2}\int\vec{A}\vec{J}dr^3=\frac{1}{2} \vec{\mu}.\vec{B}[/itex]...
View Articleenergy due to a charge is infinite??
hello.. My professor said "Law of conservation of energy is not applicable to waves." This puzzled me a lot and trying to think otherwise i have a doubt regarding energy due to electric field. It seems...
View ArticleHow to create a eletromagnetic field with frequency?
Let's say I wanna create an eletromagnetic field with a 13.56Mhz frequency... How do I proceed it with a circuit? I don't need a large explanation, but please tell me how do I learn about it. Thanks :)
View ArticleForce exerted over a small time and big time frame
Hi Why is it that if you hit an object fast it requires less force to break it than if you hit the object slow and applied pressure to it?
View ArticleAltitude and air density
As we go higher up a mountain, the air pressure decreases. But why would that cause the air density to decrease? Since pressure is hpg, so if h decreases pressure decreases but what causes the air...
View ArticlePerson/object spinning
Hi all, I was wondering if one on you could answer this question. Imagine a person standing on a spinning merry go round. The friction exerted by the floor is the centrifugal force that keeps the...
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Euler-Bernoulli Beam
I'm trying to model a Euler-Bernoulli beam to gather the total angular torque it will provide on a hub on which it is anchored. The beam is a cantilever, and I'm using the standard deflection equations...
View ArticleBeyond Kinetic Theory of Gases
Are all collisions between fluid molecules perfectly elastic? I was under the impression that they were not, but now I'm not sure if I'm wrong or not...
View ArticleComputing coefficient of friction without experiment
Is there theoretically any way to compute a coefficient of friction (solid on solid) without an experiment between the two materials? Say, some kind of simulation, or perhaps comparing both materials...
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Optics- noise reduction technique (please help)
The above image is taken from P.Cielo's book. This is the noise reduction technique for environmental noise. Could any one explain what does the highlighted text and its corresponding diagram mean?...
View ArticleDensity
please help me solve this problem. This problem is from Physics by Giancoli. This is not my assignment because I graduated already and I am not taking any MD neither this is HW of any of my friends....
View ArticleLenz Law copper tube thickness question
For the classic Lenz law demonstration using a neo. magnet dropped down a copper pipe, is the magnetic force generated correlated to the thickness of the copper pipe? Ergo, will the magnet go slower...
View ArticleDegrees of freedom
What are the number of degrees of freedom of 1)a square sheet moving in XY plane 2)a triangular lamina moving freely in XY plane
View ArticleIs a resistor a capacitor?
Suppose a resistor is connected on both sides to a copper wire, in a simple circuit with a battery. Resistor and wires are cylinders of equal diameter. A DC current is flowing through the resistor and...
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Friction conditions on contact point of disc
Hello, I have some doubts regarding the friction force on a certain situation. Imagine a disc over a fixed flat surface. Like this: The disc has two motions, rotational and translational but these are...
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curvature of a trajectory
Hi! Can someone please explain how does the limit in the attachment equals the curvature of a trajectory? I do not understand it. Why is it defined this way? ζ=dx/dl and it is in the direction of T....
View ArticleCyclotron radiation paradox!
Description of the paradox: We have a charged ring, which rotates at high speed. Since rotating charges produce cyclotron radiation, it emits photons. There is a toroidal mirror around the ring,...
View Article4th order Diff Eq (Harris Hearst equation)
How can I solve the fourth order partial differential equation \ a\frac{\partial u}{\partial t} - b^2 \left( \frac{\partial^2 u}{\partial x^2} \right) + c^2 \left( \frac{\partial^4 u}{\partial x^4}...
View ArticleWork needed to move conductor in constant electric field
How did Walther Lewin arrive to the result W = x*(σ/2ε0) in 3:00-4:00? Ie, why did he take the average? I don't get it entirely. http://www.youtube.com/watch?v=7NUbsQt-G9U
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