Effects Definition and 963 Threads

Q:can anyone explain heating effect E=I2Rt? and heating effect in a resistor?

A battery charger which works from the 240 V mains supply contains a transformer which provides an output of 15 V. What is the number of turns on the secondary coil if there are 6400 turns on the primary coil of the transformer?

When an air passes over the wingtip of the airfoil, the upwash created at the leading edge 'reduces' the Angle of Attack, thus reducing lift. So why does this affect increase induced drag. The way I understand it, the greater the AoA (more lift), the more induced drag that is generated. Help...

Hello all - New to the forums so let me start by saying hi to everyone. ;) Something has always bugged me about considering entanglement effects as "instantaneous." As we all know from SR, moving observers do not agree on simultaneity between two space-separated events. If we...

This Question is about the magnetic field which is needed to keep electrons in uniform circular movement (UCM) when their speed is not negligible compared with the speed of light. If we ignore relativistic effects, magnetic field will take the following value: B = (v*m)/(r*q) Where...

Do higher wavelength radiation have more pronounced diffraction effects than low wavelength radiation, and why is that?

There is a point b/t the Earth and the Moon where the gravitational effects of the 2 bodies balance each other. How far apart from the center of the Earth is this point? Answer: x = 3.44 x 10^8 m (from the earth) or 3.82 x 10^7 m (from the moon). I have no clue what to do. I assume you would...

Hi, having trouble finding detailed experimental evidence to support some conceptual illustration work I am undertaking to describe a manned orbital habitat in LEO, that can function as a long-term maintenance centre. A draft schematic of the current idea can be found here...

theres a problem in wheeler's spacetime physics (exercise 2-9) which goes like this : you are in a horizontal railway coach launched upwards from the surface of the earth. there are two ball bearing at opposite ends of the coach. can you distinguish whether the coach is rising or falling by...

Homework Statement this is a picture of an example from the book. I am going off of it to solve a problem that will be on my test tomorrow. i can figure out how to calculate the shear force and moment of each section (though i don't fully understand it), but I am just not getting how they...

Homework Statement I am to show that quantum effects are negligible in: (i) The diffraction of a tennis ball of mass m=0.1 kg moving at a speed of 0.5 m/s by a window of size 1X1.5 m^2 (ii)The tunneling probability for a marble of mass m=5 g moving at a speed of 10 cm/s against a...

Homework Statement say you have a thermally insulated box which is separated into equal parts by a thermally insulated piston (frictionless) and each part has the same number of molecules and both sides are both at the same initial temperature, pressure, and volume and have the same...

In an attempt to explain space-time curvature and gravity, the analogy of a flat rubber sheet is often used whereas a massive object, such as a bowling ball indents the sheet in the same way that a massive object such as a star creates curvature in space time. Would it be a fair analogy...

Homework Statement A billiard ball (of mass m and radius a) is struck by a cue and moves off with initial speed u, sliding (without rotation) along the table top. After what time will the ball roll rather than skid, if the frictional force between the ball and the table has magnitude qmg...

I've read several posts, but still have some questions; 1) Will electronic devices that are not turned on be effected by the bomb? (ie: TV, Computers, elec. motors) 2) How long after the bomb is activated will the effects last? Surely this is only a short term thing other then the damage...

Few weeks ago a respected magazine brought some excitement with a story on missing bond between Thermodynamics and Relativity. My question is what satisfies the definition of relativistic gas and how would that differ from single star systems with shifted spectra? Take for example...

Suppose i have two clocks on Earth showing 12:00 hours. After, one of the clocks is put in a gps satellite for a year. After one year that clock returns to earth. Due to relativistic effect what time that clock shows? Less than 12:00? If so why?

In a textbook about relativity, I read that particle accelarators can get to a limit because of the relativistic effects. Is that not the limit of speed of light? Thanks for any help.

I had a question that I was hoping someone could answer for me. If light passes next to a massive rotating object such as a black hole, would the affects of frame dragging cause a blue shift or would the light essentialy travel at a speed faster than the C?

I had this lab done where we took beets and tested the effects of pH on membrane permeability. We used different concentrations of HCl and NaOH. Why did I get such a strong colour intensity with a test tube that had 0.001 M NaOH? And how do I know this experiment affected the protein...

What kind of short term and long term effects does DMT have on the brain?

My teacher asked a very interesting question. so given a runge function 1/(1+x^2) and i interpolate it on uniformly spaced point in the inteval -1 and 1 by p_n(x) How does the pole -i and i contribute to the oscillation of p_n(x)? I never thought pole would come into play.

I was recently listening to a favorite podcast of mine (AstronomyCast) and they went over the tidal effects the moon's gravity has on the Earth. I just happened to be thinking about the tidal effects after that and was wondering if the moon's gravity effects things in orbit of Earth. More...

I am just curious, can frequent masterbation have a permanent reduced sperm count side effect in the long run ?

Back in the early days of telegraph and telephone lines, electromagnetic storms emanating from the sun shut down communications services over land lines. As the decades progressed, solar storms no longer affected those lines. What engineering change was made to land lines to insulate them...

Why does the double-slit experiment with a laser work properly in an atmosphere? Likewise, I've seen news reports of entangled photons transmitted in a fiber or in open-air used to generate a shared secret. So, both superposition and entanglement works. But, the fact that the speed of the...

I am starting to program a simple physics model of a car to help me understand how it works. I am certainly going to have to make quite a few simplifications as I'm only just about to start A levels. Whilst researching how to simulate engine braking I came across the Racer (racing simulator)...

I was wondering how the time period of a double pendulum depends on the mass of the intermediate object and its distance from the bob?

Sirtuins are enzymes which repair telemeres that deteriorate to cause aging. They are normally released in response to stress such as calorie restriction or low insulin levels, but sir2 can be stimulated by certain chemicals. Why is it unfeasible to take molecules like resveratrol (found in red...

Which should happen around December 2012 according to NASA. From what I have read this could be the end of the world and a beginning of new.

Hi Does anyone have a link to a proof that magnetism is a result of relativistic effects on a moving charge? I am sure that I have seen one but I can't find it. Thanks John

I'm working on a project that involves putting electronics equipment into a solid metal (aluminum) case. The cases are sealed watertight and I need to be able to transfer the heat originated at the electrical components to the ambient air. I can perform the analysis to get a pretty good idea...

Homework Statement A vertical force F is applied to a block of mass m that lies on a floor. what happens to the magnitude of the normal force N on the block from the floor as magnitude F is increased from zero if force F is a)downward b)upward Homework Equations Let m be the mass of...

Homework Statement An electron is projected at an angle of 31.7° above the horizontal at a speed of 8.40×10^5 m/s in a region where the electric field is E = 383j N/C. Neglecting the effects of gravity, calculate the time it takes the electron to return to its initial height. Homework...

why does a razor blade placed on the water surface move away from a charged body?

What would be the practical effects if it is proved that P=NP and an efficient polynomial time algorithm is found for NP-complete problems? By practical effects, I mean the practical effects of perfectly solving the problems which have been proven to be NP-complete (like Boolean SAT...

The following diagram is of a setup consisting of A bulb A pair of wires...making an angle theta with the place the bulb lies in now if the setup is seen by an observer moving at a speed 'v' relative the angle the wires make with the plane changes to phi>theta(i can provide the...

hi friends can you help me in collecting systematically some important phenomenon or 'effects' in astronomy and astrophysics like rossiter effect, yarkovsky effect.:cool: even recently discovered phenomenon and related explanations are welcome.:approve:

Ok, i am given this task by my physics group leader and is required to do an experiment based on the following research question: To investigate the effect of temperature to the conductivity of a charcoal rod. i. How do i heat a charcoal rod to a desired temperature and make it remain...

i heard that a faraday cage is often used in shielding e.g. sensitive electrical equipment. I was just wondering, because, in http://socrates.berkeley.edu/~fajans/Teaching/cartoons/Shielding/TestChargeShielding_files/frame.htm it seems that the electric field is not zero at ALL times. i.e...

If Earth could be considered the only body acting gravitationally on a length of rope, if the rope say a 1 mile length, is aligned in a straight line with the center of the Earth in some orbit, when the rope is free, will it tend to curve to the shape of the orbit, or will it fall in on itself...

Quick question (...and I hope I have this in the right forum) Does anybody know anything about the effects of inhaling dust particles of anodized aluminium? I am especially interested about finding information on any possible negative effects on the respratory and cardiovascular systems...

I have heard that while pi is known to many millions, even billions of decimal places, gravity makes it both fundamentally and practically impossible to measure pi to more than 10 significant figures. I find this to be a very strage theory, and have never heard of it before. I am also finding...

As the temperature of a body is increased, how does the frequency of peak intensity change? How does the total amount of radiated energy change? When the dimmer control is used to increase the voltage to the bulb, the temperature of the glowing filament increases. As a result, the color...

An increase in the OH- in a solution would result in an increase in alkalinity (baseness). an increase in acidity. a pH of 7. a decrease in pH. i think it would be - an increase in alkalinity, but I am not sure help!

Hi, when two cylinders in contact, but not parallet to each other (skewed), are rotating, there is a development of forces between them which tends to push one cylinder along its rotation axis and the another one to the opposite side. In other words, there will be translation movement between...

Can some one spread more light on coanda profile its effects ,calculations etc

I was just reading "A Briefer History of Time". Stephen Hawking describes how your body would be torn to shreds by the increasing forces from gravity as you approach a black hole. I've read this from other sources as well. However, from what I understand about general relativity, gravity...

If I remember right this is the active ingrediant in motion sickness pills - if high doses of dramamine (for example) are taken you are able to hallucinate. This is considered a deliriant? How would you rate the power of this drug compared to any other substance or device that creates...

I am interested in measuring the effects of a magnetic field on an electron in a tunneling state. I know very little about solid state and I have very little experimental experience. In order to learn what is required to perform such an experiment, I thought I would pose my question here...