Cause Definition and 566 Threads

I know about cosmic expansion, but I was just curious, could the observations of redshift be caused because space is cooling, not expanding. From what I understand, as things cool they redshift. If the universe started cooling after the big bang, wouldn't everything we saw from the early...

I have propelled a wagon by a spring that gives out a constant force with various weights added and the wagons acceleration when the first weight is added increases from what it was with no weights. When the next weights are added the acceleration fall from what it rose to but I'm stumped...

Homework Statement Using sketches and equations briefly describe how Bernoulli's equation and other factors cause lift force to be generated by a wing. Homework Equations The Attempt at a Solution I'm struggling to find anything else that causes lift except bernoullis! please help!

It's for a project at school. I really need some help... I found this website... http://www.astronomy.ohio-state.edu/~dhw/A873/notes6.pdf and also here's my current work on my paper... STATEMENT OF THE PROBLEM 1.) Is heat present in the outer space? 1.1) Are there any matter/...

Here I found a scientific article in the International Journal of Biological Sciences concerning a study on rodents fed with genetically modified organisms. Two of the GMOs, MON 863 and NK603, are approved by the European Food Safety Authority. Here are the links...

The 21st century: Is there a "cause greater than oneself" anymore? It seems that in today's society, (heavily consumer and inidividual based), there isn't much to live for other than the satisfaction of the self. Sure there's "Donate $10 to Haiti" and events like that, but these causes are very...

here, what people claim at my country, based from what i know, bathing at night is one ways to treat insomnia, any idea?

Hey everyone, I'm not a math or physics major. I've just read a bit about quantum physics and find it interesting. If i understand it correctly, with the two slit experiment, when you send one particle at a time through without a particle detector by the slit, it results in an interference...

Why does incest cause defects in organisms? If humans have sex with other humans that are related the baby will most likely have a defect. But If you have sex with someone who you are not so closely related to your chances of having a defect are less. Why is that? Humans had to have started out...

Cause of event of Global amnesia ?? The senario the person is normally non- alcoholic; over a two week period a bottle of red wine is consumed in small amounts a'memory laps' seems to occur with the individual' forgetting' to apply the car hand brake on three occassions over another...

I assume wind is also a factor but would the gravitational pull of the moon be the main force behind the oceans tides? To be honest I have no idea what even causes the wind so go easy on me if that was a dumb question.

The primary problems with mental causation are nicely summed up by Yablo (“Mental Causation” The Philosophical Review, Vol. 101, No. 2 (April 1992) ). http://www.jstor.org/pss/2185535 Yablo defines dualism as follows: In other words, the physical description of the color red as it appears...

Hi Everyone, There is something I am having trouble I am understanding. Why does a spinning propeller cause a plan to yaw while it is taxiing? Also, how does the flow behind a propeller effect the performance of the control surfaces on the tail? Does it have any effect? Because the flow...

Im working on a project that involves me making a electrical circuit that will supply initially around .52 amps of current for and then drop the current to at least .40 amps of current to a actuating wire that uses current to cause wire to contract. The way i have my circuit made is that i have...

DC doesn't cause electromagnetism? That is what our teacher says. Can anyone explain why it doesn't? As far I remember I made an electromagnet from a nail by passing current through it from a battery cell about 6 years ago.

It is my understanding that in classical mechanics, cause and effect are universally accepted. Is it the same in QM? Is causality sound in QM?

What factors may cause the experimental value of acceleration due to gravity to be different from tha accepted value in a free fall experiment? Will it be something like air resistance , human error , instruments error or wrong calibration ??

If a full scale thermonuclear war were to occur, would it cause the literal extinction of the human species, as well as life on Earth as a whole? I've read about military supercomputer simulations of this scenario, and does not result in human extinction. Although many Billion people do die...

Static & kinetic friction could cause motion?? Homework Statement I have a question about friction. I was asked to discuss an example where static friction and kinetic friction could cause motion. One example for each. I have never learned friction causing motion and I thought of it but...

Last topic I made was misunderstood and locked so basically what I want to know is the mechanism behind numbness in legs. I don't have a numbness problem or seeking medical advice. If veins have reduced blood flow how does this create numbness. The nerves are still supplied by the arteries...

Could somebody, possibly, provide a list of the mutations that cause aging- the specific mutations- "hotspots" and/or discuss that with me (ie you could pm me) thanks

As we all know, pathogens ( bacteria, viruses, fungi and prions ) cause diseases and illness to their hosts. I am just wondering if there is anyother type of biological agents or phenomena that can cause diseases besides pathogens?

What might be underlying possible causes(s) of Halocene warming over last 15000 years? Any mild Milankovitch forcing by just 20k precession effect? http://en.wikipedia.org/wiki/Milankovitch_Forcing"

I decided to post this in the philosophy section because I would like to get the philosophical implications of the statement below if true, rather than one based on current interpretations of QM (MWI; CI; BI; etc). statement: Can any event occur that has no cause? What does the above...

The path taken by a ray of light, from an event E1 to event E2, follows a zero arc length curve such that E2 ∫ds = 0 1. E1 Where S is the interval along the null geodesic path between the...

I have created a circuit. The batteries are in series, and the igniters for my rocket are in parallel. There are three igniters. When I check the voltage that will be going through the various igniters, the voltage appears to fluctuate. It goes from 0 volts to 2.5 volts to 6 volts to 18...

One of the main criticisms I hear of religion is that is responsible for so many wars throughout history. If religion is held to blame for the crusades for example, then by the same logic shouldn't we be holding democracy and freedom to blame for current wars such as Iraq and Afghanistan?

I was sitting in physics class today and the question of speed of light came up. I asked if anything could pass the speed of light, and the professor stated that Cerenkov radiation was particles moving faster than the speed of light in water, and it resulted in a "light boom." My question to...

Homework Statement An unknown compound gave a melting point of 230C. When the molten liquid solidified the melting point was determined to be 131C. Give a possible explanation for this discrepancy. Homework Equations The Attempt at a Solution I understand that melting point...

If the expansion of the universe DID increase entropy, it would explain a lot of things but also leave me with a lot more questions.

This may be an easy answer for AtsroPhys vetrans. But I'm assuming since the doppler effect of an accelerating galaxy causes reshift, then the time dilation from a gravitational field would do the same. This is referring to very powerful fields, and also to redshift in all waves (not just...

hello everybody, I have the opportunity to study nuclear engineering in the us and i'll be sponsored by a corporation in my country and i need to sign a contract which will force me to work in their power plant, so my question is does it cause cancer or it is safe? am i going to bre...

when we apply potential difference across any conductor the electric field set up in the conductor which apply force on charged particles and set up moving current.While the current is moving the charge which is at the outer surface of conductor also make elecricfield which is moving along the...

Now this is something that just came to mind. As an undergrad Physics major, I have already taken a few introductory Physics courses. We have studied gravity, electromagnetic forces, etc. All of the work we have done involved measuring these forces and understanding how a body will react while...

I understand that reflected waves on a transmission line are a result of the constraints of Ohm's Law and Kirchhoff's Law at the transition points. However, I'm having trouble visualizing the physical cause for this. What is actually causing the electrons to flow in the opposite direction...

when someone welds , why does it emit blue light , is it because of the ntirogen in the air.

My physics book says that the magnetic field is caused by moving electrical charges, acts only on charges with a motion vector perpendicular to itself, and the force it exerts on a charge is proportional to the velocity of the charge. How does the moving charge cause this force, which does not...

I was wondering if the worst case scenario in case of an avian flu pandemic, if it were possible for the virus to cause the total and utter extinction of the human species? What if it mutated into an ultra-pathogenic human strain? There is almost seven billion human beings on planet earth...

I understand the different ways that pores may be formed in a metal, however what i want to know is how it affects the properties of the metal. Am i right in thinking that it would increase the fatigue of the metal, since a large scale of porosity would make the metal more prone to crack formation?

Is Bernoulli principle the cause of suction truck?? Hello! I’d like to know this question: When a truck walks to a high speed we see how the road tree leaves are dragged behind it. I would like to know the real cause of this problem. I think the air viscosity makes the truck drag a thin...

The 1-2 ky climate cycle is clearly evident in the paleoclimate records and is of primary importance in future predictions. But what actually is the driving mechanism of this cycle? http://www.sciencemag.org/cgi/content/abstract/278/5341/1257

In EM wave polarization. Where is linear polarization where \gamma =0 or \pi . \gamma = +/- 45 deg and amplitude of Ex and Ey are equal to give circular polization etc. My question is why there are different angle of \gamma on the first place? If you set the reference at x...

Is it possible to get frostbite from compressed air? How does this happen?

hi everyone.. my lecturer gave each of us a task..we have to give a short presentation next week. everyone have a different topic..mine is this: "Explain the observation that a copper wire will bend smoothly around a finger, whereas a mild-steel wire will kink and deform to a polygonal...

I am new to interrupts, so i have made a simple program using a timer interrupt to cause a delay of about 1 sec in displaying the binary numbers. However I have failed to achieve this. Anyone knows the problem with my program? any assitance will be highly appreciated. #include...

Homework Statement No data Homework Equations No equations. Theory The Attempt at a Solution Freezing the soda can will makes the soda can contract, thus increasing the pressure of the soda. P=F/a. However, as pressure had increase, to the air particles in the soda can will have...

i.e things happen for no cause. Thx

Hi everyone, Not sure if this should be here or in the chemistry section. It's a question about chemical reactions in aluminium. I work for a construction company and we have a number of aluminium sheets used for cladding and roofing. We've noticed that some of these have a blacking and...

Not a homework question, Just trying to get more information about it. Its hard to find a textbook or a site that explains this well. thanks

http://www.snowballearth.org/could.html"