Act Definition and 193 Threads

Homework Statement Why can we assume that atoms in a solid material act like hard balls? The Attempt at a Solution because they are tightly packed together when in a solid state[/B]

Hey guys, I've been running this though experiment in my head for a while now and to be honest, I am not that much of a physics guy so I figured I'd ask a few questions to see if what I'm thinking about it even physically possible. (Not that it is even realistic, but hey.. who cares right?)...

Why is it that when a light is on in a room with a window made out of glass, and it being dark out side the window. That you cannot see through the window and instead see light being reflected form the room around you. And vice versa when it is darker inside the room and brighter out side you...

What do you guys think of the I-Squared bill? https://www.congress.gov/bill/114th-congress/senate-bill/153 Seems like a good way for businesses to skirt paying taxes and higher wages to American workers.

Just out of curiousity, why is this? I'm reading this page right here: http://newt.phys.unsw.edu.au/jw/fluteacoustics.html#registerhole A dark hole on the flute means the button is closed, and each white hole means the button is open (open to atmospheric pressure). You can see from the...

SCOTUS decided 6-3 not to wreck the ACA http://abcnews.go.com/Politics/supreme-court-upholds-obama-health-care-subsidies/story?id=31931412

Homework Statement I am doing an egg drop project write up, and one of the components is to draw a general egg drop device diagram, and to write down the general forces which would act upon the egg drop device, both inside it, and outside it. Any suggestions? Homework EquationsThe Attempt at a...

So I am only a sophomore but I feel that i have my mind set on going to college and embarking on a phd in physics. As of now I seem to go by school quite easily with a 4.0 and I don't even study (I go to a pretty nice private school) . Not like that's something I should really be bragging about...

"We can’t make a measurement without influencing what we measure. before we look, there are only probabilities. When we open the box, they give way to a single actuality" It would be more like this, all the time, Until we look...

The fastest moving pulsars are theoretically spinning neutron stars. They probably got their velocity from a kick from a supernova like Project Orion. http://chandra.harvard.edu/photo/2012/igrj11014/ http://chandra.harvard.edu/photo/2003/b1957/closer_look.html As I understand it, neutron stars...

Hello There! Can I have some tips for taking ACT. I took for the first time and got 26, can y'all tell me how I can get it into 30's?

A major change is happening in the way LQG is formulated. Suzanne Lanery gave a seminar about this 5 days ago (10 Dec) at Perimeter, and today she gave a similar talk at Nijmegen (Renate Loll's seminar). It's evident there is a lot of interest in this new development, which is based on the 11...

Hi all To observe interference of light waves in Young's Double Slit Experiment one needs to have coherent sources.Some,doubts are coming in my mind regarding coherent sources. Q1. Will it make sense to talk about a single source as coherent source(not sources) Also two(or more) sources are...

Hi, I don't know if this is the best place to post thia, but I'll give it a try :-) I'm taking the SAT subject tests physics, math level I and level II, and the ACT test thia coming year. As I'm not following a high school curriculum, and am merely studying on my own, I really have no idea of...

Homework Statement A team of Mexican acrobats are developing a new act. Four see-saws are arranged in a square so that the ends of the see-saws overlap as shown in the plan view below. Each member of the team has a mass of exactly 50kg. (a) Calculate the contact forces between the see-saws...

According Pascal law we get force high and low to the applying force...why fluid not behave like ideal solid body force transfer mechanism... Mean in fluid,how fluid particle manage grater and lower force to the applied force...how particle s manage it?

Due to the fact that I don't have any plans on damaging my chargers (something I am not planning to risk at the moment) I have not been able to confirm whether the transformers in chargers act as a load when nothing is charging. From what I have read, based on the design of many chargers, even...

Does a dead 1.2V rechargeable AA NiCad battery act as an open or closed circuit? My electric toothbrush's rechargeable battery recently died and the manufacturer expects me to replace the entire unit. Personally, I think that's a waste of money so I've already opened it up and I can see the...

I understand that an inductor acts as a closed circuit to DC because it's just a coiled wire but why doesn't it act the same way for AC? What does it act as in AC?

In my simulation it did act like a low pass filter so it definitely is one! <a href="http://tinypic.com?ref=657vdh" target="_blank"><img src="http://i59.tinypic.com/657vdh.jpg" border="0" alt="Image and video hosting by TinyPic"></a> please tell me if the following is correct...

say a guy is eating and gains mass does this act of gaining or losing mass considered a motion? i know mass has a property called 'inertia' (or is it the other way around where inertia has the property of mass?) and inertia is the 'resistance' to motion or change in state of motion but i don't...

i was just reading the following article and had an interesting thought; http://www.ipod.org.uk/reality/reality_arrow_of_time.asp Referring to the following image (http://www.ipod.org.uk/reality/reality_arrow_of_time.asp ) Both Feynman diagrams are said to be mathematically equivalent...

Today in 9th grade ADV Biology, we learned about how the two Hydrogen atoms in a Water molecule are relatively positive compared to the Oxygen atom. This is because the Oxygen's pull on Hydrogen's electron is greater than the Hydrogen's, or that its Electronegativity is greater. This unequal...

I read an article that anion vacancy act as a 'hole-killer' which prevents p-type doping. I couldn't understand this sentence first time when I read, so I studied for that. I finally conclude that this anion vacancy act like positive charge, and this positive charge repel p-type doping...

Why less originated area act as anode in a metal ?

It's clear that both ends of the economic spectrum feel a sense of entitlement. http://www.upworthy.com/take-two-normal-people-add-money-to-just-one-of-them-and-watch-what-happens-next

Homework Statement Suppose there was a planet in deep space. Now drop an object in it's gravitational field. This object has no velocity whatsoever in any direction. Now, would this object start moving straight toward the planet (because that's the direction of net force) or follow a...

Hello. I am a high school level student and I had a question about weak acids/bases and why they wouldn't work as a buffer on its own. If the dissociation of a weak acid is HA \rightleftharpoons H^{+} + A^{-}, then when we add OH^{-}, it will react with the H^{+} to form water. Because the...

What I understand is this: Shell theorem states that the force of gravity is focused at the center of an object. But, say that there is a large planet with a gravitational force equal to that of earth's. It is perfectly round… and hollow. Since it is hollow, how large would it be to have Earth's...

Planck's radiation law: "Act of desperation" Why did Max Planck refer to his own radiation law (http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=35774&fbodylongid=1696) as an act of desperation. Was it because it was only mathematical and that he didn't really understand why the...

Dont give me the answer that its because of surface tension. I want it in detail.

...if objects at rest have an acceleration of 0, and the net force on an objet equals m*a, then doesn't that mean there must be no net external force on the object? What am I missing here...??

If it does, is there a way to calculate what the force of a single photon would be if it were acting in 3 dimensions?

To anyone who saw my previous thread, yes, this is quite similar to it :-p. Homework Statement Given a rectangle, say a painting, with with mass m, height h, and width w with two point supports to a wall at its two upper corners, what force does each support exert? Homework...

The title basically says it all, I'm wondering whether dark matter will allow sound to pass through because if it does, that could lead to being a way how to detect dark matter.

A bit confused about the operation of normal forces. When does a normal force act due to some surface on an object? When the object touches the surface or when the object actually applies a force on the surface? The reason I ask this is because I am confused about normal forces...

Hi PF, I have a transistor circuit with me with IFT . Please see that if this circuit can be used for AM generation. Also please suggest the design procedure and working of circuit. Please point out any errors in the circuit. I don't know if I have to supply separate carrier signal(I...

Homework Statement P=hρg is the pressure difference but where does this pressure act upon? In a standard barometer there is a vacuum on top so 0 Pa, and at the bottom the normal force acts on the glass base. So hρg=Pweight. But theoretically, where would the hρg calculated be acted upon? Or...

For servers, programmers are using instancing to lower processing needs. When i think about it, it seems like the universe is exactly built like that.. Especially when we measure things this becomes so obvious. On sub-atomic level we can see instanced results directly, without question...

I took the act twice an got a 22 and 23 math subscore. Is that bad or good? Does thar mean I'm ready or not ready for calculus?

Im wondering how potential can act as a boundary for electrons in a 1-D time independent infinite well?

i have a three part question. how does light act leaving, traveling between, and entering a galaxy? we have come to the conclusion that the speed and direction of of traveling light is effected by its surroundings. I'm wondering what that looks like at a galactic scale. first, leaving a...

I was just wondering, that if we have two electron beams passing by each other, would there be any magnetic interaction between them ? Just like, electrons in current carrying wires. I asked the similar question earlier but with the change that one of them was a current carrying wire, whereas...

Let's say that a positive charge is held in position. A negative charge, which is 25cm away, is then attracted to this positive charge. But as the negative charge is moving towards the positive charge, it creates a magnetic field. Would this magnetic field then push the negative charge...

Given the following description: A 10 kg board 1 meter long rests on a table with 0.3 meters extending beyond the edge. I expect two forces: The normal force on the board from the table, and the weight of the board upon the table. The board is in equilibrium. I think these forces occur at...

Hello everyone. I'm trying to understand how an 'induced' emf behaves on a current carrying conductor. Basically the example that's giving me problems is in the case of a motor, if a current starts to pass through a coil it will get an induced 'emf' to oppose the motion. And hence it...

A problem asks to find an abelian group V and a field F such that there exist two different actions, call them \cdot and \odot, of F on V such that V is an F-module. A usual way to solve this is to take any vector space over a field with a non-trivial automorphism group, and define r\odot \mu...

Hallo everyone! I was wondering is it possibile to use magnetic attraction/repulsion to increase speed or rotational speed of an object? this video is a quick illustration of what I mean. If it possibile to use magnets as "accelerators" how is it possibile? from magnetic fields? or...

I was reading about the two slot experiment and how electrons appear to be wavelike as well as particlelike. How can this be the writer asked. It started me to consider water waves and what they are. We never think of water as a single molecule. We always think of it as what we observer...

enzymes are considered inactive at low tempertaures, and denatured at high temps.both these terms have different meanings, with inactive meaning enzyme having "low activation energy"and denatured meaning the enzyme is destroyed. when an enzyme is inactive, it does not lower the activation...