Classical Physics

These 2 possibilities is what bi can come up: 1) According to Newton's first law, if the force of the airplance is equaled to the force of the air, it goes in a straight line.... which means the air force (I mean not the millitary stuff ) also increases as the the force of the airplance increases.... but how can the airplane accelerate in the bigginning...? 2) According to Newton's third law, when the force exirting on the air, the air exerts back, but therefore the plane cannot even move, since the plane also exerting backwards and the air exerting back....... Anyway, ithink the reason for this is all about pressure of both (air + plane) and its transfor…

I was thinking about gravity and it seems to work on a flat plane spanning outwards from the equator of the central body. Galaxies tend to be flat. Our solar system appears flat. Even the satellites orbitting planets appear to be on the flat plane outwards from the planets equator. Not only that but they orbitting objects seem to follow the same rotation as the central body. I even checked it with this nice interactive applet. http://www.solarsystem.org.uk/planet10/ Doesn't that imply two things. 1 - That the gravity emitted by the central body is strongest at the equator. 2 - That gravity causes a drag/towing effect too. I can accept that our moon eith…

I have a question (and it probably sounds really stupid), A closed vessel containing pure O2 has a tempreature of 20 degrees © and a pressure of 3000 psi. If it is heated to 800 degrees © what is the change in pressure and how do you work it out? My Dad wants to know this for where he works, hes a welder / engineer by trade and apparently they're creating some kind of vessel thats going to do this.

Since an absolute vacuum is only empty time/space, how can it be bent by gravity if it does not have a mass greater than 0? Just aman

Can anyone point me to a good site that has lots of physics problems with the solutions worked out? Problems dealing with charge, Gausses Law, and electric potential would be especially helpful. Thanks

Hi! I really want to make a difference in my school's science fair on january.. Usually, the interactive projects are always similar and they aren't any fun at all. I want to win at the contest and this interactive science project is also the basis for majority of my physics grade.. please help me.. I want it to be fun.. maybe magic associated with Physics or any innovations that is not yet so common in the market would be helpful.. email me at honz415@yahoo.com... please.. help me.. =)

Ionic compound decomposes when polar molecules attract them. How about non-polar molecules? What forces make the non-polar molecules dissolve in non-polar molecules solvent but not in polar?

Hi, I have sort of a problem: I have a routine to calculate the geometric place of the bodies in our solar system. But the question is that the results are referred to the J2000 epoch frame. I was trying to convert the vector [ x,y,z,vx,vy,vz ] from the J2000 epoch to one TDB choosen epoch, correcting the values for precession and nutation, getting [ x',y',z',vx',vy',vz' ]; and then, convert this result vector to the ecliptic plane, obtaining a new vector [ x",y",z",vx",vy",vz" ]. Does anyone knows the routines to make this calculation? Please answer as soon as possible - this is very urgent. Kind regards, Kepler

If two object with same mass, over the ground at the same height, are pushed horizontally. But the force applied are different,say for object A , the x-velocity is 10m/s but for B is 20m/s? The time for them reaching the ground is the same. I want to question about what will be observed if one is with speed of light and the other is a very low speed. Will the observation change if the first object's speed is not c but near to c?

I moved into some other forums and looked at some question. There are two questions I cannot explain them clearly althought they maybe very simple. 1.Do a wheel and a ship have the same kinetic energy (same mass + same velocity)? 2.Mass of a thing increases when there is collision with that thing.

I`m sitting here with a nice 3 year old bottle of dry red wine and got to wondering, the Fluted Corks often seen in Champage bottles, HOW do they get them in there? this is a straght cork that`s a little swollen and it`ll hardly fit back in the bottle (contrary to popular beleif, I`m not greedy with booze, only beer). I simply can`t envisage a machine that can compress the cork small enough to fit the bottle neck and come out of the bottle without ripping the cork head off or just pulling the cork back out again. any ideas?

I want to learn more about mechanics, the basics and advanced concepts. If any of you have any books to recommend, PLEASE DO SO! Also, any books on the following: Rocket Science Nuclear Physics/Nuclear Chemistry Biochemistry Astrophysics Cheers!

A formula with which i could calculate the power of my BP Thnx for any help LP Aspirin

I'm in no way a physicist (I'm not even sure I can spell it right), so I don't know if I'm posting this in the right forum, but here goes: Say you had two identical pistols shooting one bullet each straight at each other, as such: [GUN A]--------X--------[GUN B] Assuming the bullets also would be identical, fired at exactly the same time and hit each other right at their tips, what would happen? Would they for example go to a complete halt at the point of impact, or ricochet off somewhere? Would they mold into a single piece of metal? What kind of sound would you hear? What do you think?

this thread is for links to online physics resources especially online physics textbooks and lecture notes but also links to handbook-type data, images, webography. there are a lot of online physics textbooks out there and course materials of all sorts including animations. Maybe we can pool what we've each found. categories overlap---one text might cover some classical mechanics, some relativity, some quantum mechanics---so probably the best thing is everybody who wants can throw their favorite physics links into one pile and some of us sort it out later if necessary. in case it needs to be emphasized, all this stuff is free for individual download and fo…

Just curious...I've been reading about 3 fundamental properties (Length, Mass, and Time), and was wondering about direction...what is that? It's definitely not Time nor Mass, but it's not quite Length. Are there more fundamental properties? Sorry if this is too basic; gotta start somwhere. CoolATIGuy

can any body help me in these experiments: 1- experimental observation of total internal reflection by a prism 2- simple experiment with beam splitter 3- assemblinga lens-pinhole spatial filter if u have any labreport about these experiments, please give it to me if u can thanks

Recently I have seen several articles popping up about how streamlined shapes may actually be less efficient aero/hydrodynamically than was once thought. The observation of the bumps on the leading edge of humpback whales fins, lead to a detailed analysis of the efficiency of these bumps, hyrodymaically speaking. The study concluded that the eddies produced by the bumps as they glide through the water slightly lowers the pressure of the surrounding water increased the ease with which the whale could manevour. A similar article about using 'wavy' hulls appeared in last week new scientist. It concluded that the wash/wake produced by a ship was severly reduced by modify…

In the deep ocean, assume the pressure is about 10 atm , while the pressure at sea level is 1 atm. The density of the deep ocean water is slightly different from the sea level water. What will happen if the deep ocean water is carried at the sea level, expand or others? Also, if the density doesn't change, how the pressure applying towards horizontal in the deep ocean water work out? Like a man goes into the deep ocean water level, he feels that six direction force exerts on him, how do the four forces work?

hi, here,s my post. i am wondering wether you can help me with this applied mechanics question. here is the question : " if boy standing on top of a building has twelve eggs in a basket and he throws them up and on landing 8 got broken. derive an expression why 4 out of twelve did not break" thanks.

As I guess everyone knows, when a full bottle with just a small opening is turned upside down it won't leak. Not sure exactly why it's like that but I can guess. Now to the question: If the hole is to large, the water will leak out. What's the maximum diameter of the hole to keep the water in the bottle? Is that dependent of the volume of water or height of waterpillow? Think you understand, just to make sure: _____ | | |-----| <- height of water... | | | | | | \ / \ / |-| <- not leaking

I need help with a question. A material to be used for a piston rod has an ultimate strength of 414 000 kPa. The maximum load on the piston is to be 70 000 N and the safety factor for the rod is 12. Calculate the working stress of the piston rod and the diameter of the piston rod? How do i begin. I know that Stress = load divided by area, but how do I find the area when i don't know the size of the material? What am i missing? That's all the information I have. Thx

When light passes a medium, it's speed decreases. Is the acceleration of light decreased?

I made an interesting observation when fooling around with my green laser pointer around the house. In my basement there are some 70's colored posters that glow in a black light. As I ran my laser over these posters, I noticed the paint changed the color of the light. I paid more attention this time and pointed the laser at individual segments of paint. It seemed that only the red and orange paints converted the color. A few other red and orange items that respond to a black light convert the color as well. I've come to a conclusion about this effect but I wanted to make sure it is correct as my internet searches have come up with nothing regarding green lasers and fluor…

I was bought a 1,000,000 candle power flashlight as an early valentines present. I was wandering what percentage of the power output is actualy light? I seem to rem that an ordinary incandescent bulb is only 2% efficient (a 100w bulb will give you 2 watts of light output). LEDs are 5% IIRC this is a 55w Halogen bulb and I`ve no idea what the efficiency is for that type. I`de like to know how much of this 55W is actualy light power and not heat or EM. so I can work out how many candles it takes per Watt. anyone know?