Effects Definition and 963 Threads

If there weren't hills,mountains etc, (that means purely spherical earth). And suppose we weren't told Earth was round. When we walk , we would think we are walking in never ending football ground(infinitely large playground ). Isn't this the effect of so called general relativity effect...

Homework Statement Hello i just have an interesting question, and was wondering if my answer to it had any validity. Ok so i did an experiment The Current balance experiment(for everyone not familiar with it, you can google it and get all the info you want) to try and estimate mu naught...

Hi! I'm a biologist so be easy on me:) Say I had a one liter glass flask filled with air and I had a 100 psi air compressor attached to it. (I don't want to suck air out but blow more inside!) How would the air in this flask react - according to the law of ideal gas the temperature of the air...

Homework Statement A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls...

Responses from physicians, scientists, or PF members sought and welcomed.

i know that motion of source can change the frequency of wave. constant speed motion will not change the wave progagation relative to water itself.but from the point of a observer at speed 0, the propagation speed will change. so my question is what will happen to frequency? thanks for help...

Hi. The higher the velocity of an object the more energy this object has. Velocity is purely relative. When I move I might *** well consider that I am still but all of my surroundings move. So if I travel with a velocity near the speed of light matter and radiation should appear more...

If time requires movement in space time in order for change and hence time to occur then how does absolute zero in temperature effect time since no molecular or atomic movement is possible at such temperature? Does vibration constitute movement that can affect time in relativistic terms? Is it...

So, I'm working through some ideas dealing with Lagrange points. I understand that, the rotation and mass of 2 objects in space create stable areas where an object of "insignificant Mass" compared to the objects it's balancing against, allows for the placement of an object in a stable area...

Assume we have a non rigid ball. When this ball is radially free falling in a Schwarzschild metric the height increases while the width decreases due to tidal effects. How do we calculate the ruler width and height in terms of R and m? When we have two of those balls radially free falling...

How could i reduce the effect of diffusion of ions in an electrolysis cell. e.g AgNO3 Ag+ Stirring constanly would help? but that's not easily kept fair or constant. Could i replace this idea with rotating electrodes? Many Thanks, Adam

Homework Statement Here is an interesting reading to my question. http://coraifeartaigh.wordpress.com/2010/02/27/what-is-a-field/ The author wrote: The reason he said each charge will experience a different force is assuming different r (and not a constant r)? Another question is to...

Homework Statement I was asked by my lab teacher to investigate the effects on the human body of being exposed to very high and very low pressures, and while I have found some good sources of info it is not that easy to find good and quotable sources, I was wondering if anyone could offer some...

Can you please suggest me some books to read on this topic? It's for my final year project! I would much appreciate it!

is the light doppler effect a purely relativistic effect? or it is present even in the classical limit?

Hi there. As a molecular biologist my knowledge of physics is fairly limited to the topics I learned before college, but recently I have developed an interest in learning a bit more about it. More to the point a certain question has been puzzling me for some time now and I was wondering if...

In my attempt to obliterate my ignorance I'd like to discuss something related to the recent news story about a young man who attached two clamps to his nipples and then had a friend plug it into a wall socket. http://news.gather.com/viewArticle.action?articleId=281474978486647" <-- News Story...

I live in an area where the water supply has a very high amount of lime, what if any thing doe's this do to ones insides.

If a gas is enclosed in an insulated container on earth, I understand that at the top of the container there will be less pressure than at the bottom due to gravity. What I want to know is if the top is colder due to the effects of gravity. If reliable sources could provided it would be...

While observing the Sun, which is 8 light-minutes 12 light-seconds away from us. We (by visible and invisible spectrum of the electromagnetic radiation) observe its state 8.20 minutes ago. Special relativity forbids any information to travel at speeds greater than that of light. This should...

I know that Caffeine gives a boost in the amount of Beta-Waves in the brain, but what does it do to the Synchronicity of brainwaves between the 2 Hemispheres? It's well known that a brain with higher synchronicity is more efficient than a brain with uneven brainwave synchronicity... Since...

I'm very unfamiliar with energy-use in aviation, but I am wondering about what effect altitude has on parameters such as gravity (i.e. weight of the aircraft) and air-density, which I would think affects friction and combustion as well as lift. One thought I've had is that higher velocities...

Hi all, Can anyone brief some history and the Characteristics of SiC diode. I having difficulties to find the infomation about the SiC material. Beside that, how the Temparature related with the I-V curve (Eg: 200k, room temp,600k) and different between the Si and SiC at room temp? Thx.

Homework Statement a uniform rule has a mass of 90g and its centre of mass is at the 50cm mark. the ruler is suspended by a thread at the 70cm mark, balanced by a mass of weight W hanging from the 80cm mark. Calculate the moment of the weight of the ruler about the 70cm mark. What is the...

I've noticed a number of threads asking about sleep paralysis, and especially loud noises when falling asleep. I found this article and thought others might be interested. http://www.livescience.com/health/sleep-disorders-top10-100208-1.html The "loud noises" is a disorder called...

What are the known or suggested effects of γ-radiation on carbon 60?

When James Cameron made Titanic in 1997 it touched the hearts of people all around the world. I was a kid at that time knowing not much about love, pain, loss of loved ones, injustice around us, it still stands as one of my favorites; and it is always a new experience each time I see it. Rarely...

This study presents evidence that the complex endogenous (internal) electric field generated by the activity of individual cortical neurons exerts a feedback which has a global modulating effect. The linked summary links to the full article (PDF). (The second link is a bit slow as this is a long...

I was trying to read up on the effects of the Lorentz transforms on electromagnetic fields in the stationary and moving frames and came across the following equation for the E-field: [1] E= \frac {Q}{4 \pi \epsilon_0 r^2}* \frac {1- \beta^2}{(1- \beta^2 sin^2 \theta) ^{3/2}} The first...

How are you predicting the effects of emergency shut-down scenarios on your pipeline networks? I'm seeking some input on the tools you use to predict mechanical effects (hammering, etc.) from critical scenarios such as emergency shut-down.

Time Dilation- slowing or speeding up time. Acceleration Time Dilation as an object travels faster time will slow down. If an object were traveling 10,000 mph for a few days the time dialtion would be in nanoseconds, but if an object were traveling the speed of light time would "stop". The time...

Hi guys, I have chosen the variation of magnetic field strength under different temperatures for my high school physics experimental investigation. We had a guassmeter at school, however it has had a few problems, and so I've dicided to use a compass. My question is, how do i use the angle of my...

(Note: I am posting this in the classical physics section because it has a connection with Thermodynamics, also this is NOT a homework question, I am just trying to get a handle on what is going on) I was looking through some old questions I had written down and decided I would ask to see if...

I wonder where I work, 3-phase ind. motor with 80 ohms resistance per phase from the manufacturer was re winded and the new resistance per phase was 89 / 90 / 94 Ohms in the 3 phases. when the motor was put back, it burnt within few hour, why was this?

im doing this eperiment on rollercoasters and i was wondering if loop radius effects the vehicle; like if the loop was to small will it make it through? or if the loop was to big will it make it or just simply fall off? :) THANKYOU

I need help. In my work place (we mainly treat copper contaminated water), our downstream are pointing the chlorine content of our water for the cause of their copper concentration going up after the waste has gone through their chelate towers. This chlorine content shows no visible indication...

I am having a lot of trouble conceptually understanding the idea of a random effect in ANOVA testing - more specifically identifying whether a factor is random or fixed Thanks, Thrillhouse86

Hello All, I am trying to do some research to see how many known magnetic effects (related specifically to conductors) have been discovered. So far, I know of the most common one, The Lorentz Force, which is due to the effect of an electromagnetic wave moving across a wire. I am specifically...

Homework Statement a long straight wire carries a current of 2A. an electron travels with a speed of 4*10^4 m/s parallel to the wire at a distance of 0.1 metre from it. what force does the magnetic field exert on the moving electron Homework Equations what formula should i use? is it f=...

What is self and air broadening effects? I have read that they appear in atmospheric modelling. Is this pressure broadening?

for example, ethanoic acid in water, "="means equilibrium arrows CH3COOH(aq) + H2O(l) = CH3COO-(aq) + H3O(aq) we take the pH as the -log of the concentration of H3O ions. BUT why do we not take in account the effect of the ethanoate ion with water which produces OH-? CH3COO-(aq) +...

i was testing my pic microcontroller (16F88) but i forgot about the maximum voltage and applied 7volts to it. The microcontroller did not give me the expected result.To me it looks like it does not work but when i connect it to the programmer i am able to reprogram and even read from its flash...

I would like to hear some thoughts about the quantum effects that seem to be an important part of the photosynthesis (http://www.lbl.gov/Science-Articles/Archive/PBD-quantum-secrets.html" ). According to the scientists who made this discovery it seems that the photon tests all possible paths...

Hello everyone, i had one doubt in my mind regarding Rotary oil pump. The Question is what would happen if we remove oil from the Rotary oil pump. What would be its effects? Please Reply Regards Gagan Sharma :confused:

Homework Statement A car starts at 100 m/s and deploys a parachute. After 10 seconds its speed decreases to 45.45 m/s. Calculate the distance the car has traveled in this duration. The effects of ground resistance are ignored. drag coefficient and planform area product (Cd * A) = 4 m^2...

I understand that the purpose of the TestAndSet() instruction is to test and contents of the register and set new values. (returning the old value). I have a question regarding this instruction: function TestAndSet(boolean lock) { boolean initial = lock lock = true return...

If the blood pressure jumps from a long term pre-hypertension stage (140/90) to 175/110 for ten hours, and then calms down to pre-hypertension stage again, are there any long term effects on the body for sustaining such high blood pressure? From what I've been able to find out, high blood...

Hello, I have a question about how non-magnetic impurities affect the transition temperature in type II superconductors. I know that the impurities introduce additional scattering and therefore act to reduce Tc, but is there a simple formula that would relate the effect on Tc due to...

I was wondering, are there significant effects on the performance of a solenoid when the solenoid is inside an external magnetic field? Does it affect the rate at which the magnetic field is established within the solenoid?

If the moon is expanding its orbit at a rate of one inch per year, that would mean that 65,000,000 years ago it would have been roughly 1,000 miles closer to the earth. Does anyone know of a study that considers how the moon proximety to the Earth at this time may have effected the environment...