Elastic hysteresis and its relationship with some other quantities
what exactly is elastic hysteresis and how is it related to elastic after-effect,elastic relaxation time and and elastic fatiguenes.
View ArticleHow can I be sure that the action has a minimum?
When you write an action and then you calculate its minima, how can you be sure that they are minima and not maxima? Thanks
View ArticleDecaying moon's orbit
Hello, Here's my challenge: I want a physics model for how one would go about in order to decay the moon's orbit. I'm assuming it would involve using the velocity vector of the moon whereby Earth would...
View ArticleThermal losses through single glazing
Hello, I have looked through various websites, which show single glazing heat losses (U-factor) to be 5.7 W/m^2.K. But when I use thermal conductivity basic formulas, the yielded results are quite...
View ArticleCalculation of circles parameters embedded in 2 rotating discs?
The next situation is presented 2 big circles (blue ones) are rotating in different directions. The left one is rotating clockwise and the right one rotates counter clockwise. Inside the 2 big circles,...
View ArticleMeasuring flexural vibrations
Hi, I'm reproducing a measurement of vibrations and I would like your help with a certain question I have. I have a rectangular plate supported by two rods and I want to measure it's fundamental...
View ArticleIn fiber optics is the thickess of the cladding important?
Hello Forum, a fiber optic cable has two components: a core and a surrounding layer called cladding. The core has an index of refraction n_cor sligthly larger than the cladding core c_clad. This allows...
View ArticleExamples of systems that generate C-EMF?
Hi, Do you know systems that generate C-EMF? Set ups like an Electric Motor? What other system do you have in mind? Another thing. I know that CEMF is caused by a changing electromagnetic field. How...
View ArticleConceptual Question on G.P.E
I have always thought of G.P.E as how much a constrained body wants to fall in the direction of Gravitational Force Feild.But a while back i came across the concept of Gravitational Binding Energy. The...
View ArticleWhy does an object start to fall under gravity
Hi I can understand how once an object is falling in converts PE to KE. My question is how does it move in the first place. I know if we assume a gravitaional force that is fine. However from the...
View ArticleTime dependent forcing and nonlinear systems
Hi, I'm trying to find a toy (i.e. analytic) example of a nonlinear system that has very different behavior for two different types of forcing: 1) [itex]\frac{\partial u(x,t)}{\partial t}+ N(u(x,t)) =...
View ArticleThermodynamics: Is Stirling engine reversible or irreversible?
Stirling engine: the cycle is composed by two isothermals and 2 isometrica and there are just two heat reservoirs. By the isometrics I would say that that it is irreversible since you exchanging heat...
View Articlevector mechanics problem
Okay so I am stuck on this problem. A moveable bin and its contents have a combined weight of 2.8 kN. Determine the shortest chain sling ACB that can be used to lift the loaded bin if the tension in...
View ArticleResonance frequency and Natural frequency??
Say there is an empty bottle of coke., and you know for sure that the bottle resonates most at 320hz. when the bottle resonates, the bottle will vibrate. the question is, 1.if the bottle also resoates...
View Articlesimple harmonic oscillation
Trust me this is not homework... My last two questions were removed cause they looked like homework... I understand its the forum policy... From now on I will post the 'seemingly homework' on the...
View ArticleBack and forward orbit [around gravitating objects]
As I figure [and have consulted with some physicists], there no reason why this would not work: object orbiting a planet in one direction, then, half way trough, hits something that propels it in the...
View ArticleNeed help on basic fluid volume calculation!!
Hey guys, I need some help calculating a volume. Ok, so say we are given a pressure vessel with an 88ci volume @ 4500psi which is then regulated down to 100psi and we open a valve for 0.1 second. How...
View Articledesciribing intensity of human scream?
i was trying to verify the '8 years 7 months 6 days' myth/fact that states that you would have you scream for that much time to produce enough energy to warm up a cup of coffee. i assume that an...
View ArticleCapacitors: How do they store energy ?
A Capacitor stores energy when it is charging up but what is the intuition behind such a process ? I, in fact, think that as electrons are being stored on one of the plate, positive charge is being...
View ArticleWhy does it take longer to cook in lower pressures?
The textbook says "It takes longer to cook at lower temperatures because the saturation temperature is lower". But if the T(sat) is lower then it should take less time to cook, shouldn't it? Since the...
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