Classical Physics

how would i calculate the velocity coming out of an air cannon in terms of pressure, volume,barrel length, area of barrel opening, k(coffecient of porpotionalityin -kv^2 for friction)?

What is the formule to calculate the following: I have (numbers as example), Engine HP: 1000 Vehicle weight: 1500 kg Drag: 2 wheels 1 meter diameter, rubber and a metal track link 3 meters in lenght on ground contact. And I want to know the speed that the 1000 HP engine develop to the 1500 kg weight vehicle with and without drag plus to calculate for example the vehicle speed when towing a 1000kg trailer.

I want to consult a question. That's about density of things. Why the gas ( with a low density) get out from the bottom of the ocean? Which force make it come out?

On amazon.uk.co best seller list as of Friday 6Aug at 5PM (GMT-8) http://www.amazon.co.uk/exec/obidos/tg/stores/static/-/books/amazon-bestsellers/ref=cs_nav_sn_4/202-5121337-2949434 It is topped only a diet book and the DaVinci Code Penrose has been #4 for most of the day and by late afternoon had moved ahead past one of the diet books, into 3rd place. This means he is ahead of Michael Moore (#6) and Lance Armstrong (#15) and the Alexander McCall Smith lady-detective novels.

PV=RnT And Volume is inversely proportional to pressure. Volume and pressure are both proportional to temperature. What I am confused of is, when T is increased, Which volume or pressure is increased? How to make the pressure remains constant in order to test the relationship between volume and temperature? Also, Increase in pressure would increase the speed of molecules, and aren't them moving faster and make the volume increase?

I have absolutely no idea if this is the right place to post this :/ But. I need to know how density affects the volume of a drop. For example, if i have distilled water and water with NaCl. Will the solution with NaCl have a higher density and a smaller volume of a drop? Does density make the volume of liquids smaller? I hope someone understood my question and could help me. Thank you

What does tension force mean? When we pull a box , left to us, with a rope, the force act is from left to right. So where does the normal force go? right to left?? if yes, how can we feel it?

Hey everyone. I'm currently doing an experiment involving the physic pronciples of the diameter of the splatter of various liquids. I've currently taken readings of the time taken to fall from a range of heights, the diameter of the splattered droplets. Problem is, what physics principles can I really invenstigate/talk about in my report. I know this sounds like I'm asking you to do my home work, but I'm really stuck . I've tried taking photos of a droplet using a video cam, but this is nearly impossible. Well..various physics principles I have come up with is: terminal velocity force analysis intermolecular bonding (Is this really physics? or chem?) Much help…

my first post here. quite a newbie. wondering if you people could help me out here. doesn't seem like a hard question (but i can't seem to do it). anyway here goes. consider a bead on a wire that is rotating at constant angular velocity. the wire's horizontal and there's no friction between the surfaces. It would seem that the bead would swing out horizontaly on the wire (lookin at the bead system) and would form a spiral (looking at the whole system from the outside). Now, we can also work out that there is an acceleration goin outwards(horizontally). How can we account for this outward acceleration in forces? real forces i mean. thanks

I was amused by this question I saw recently on an exam paper. Lets see who can answer it. A van is accelerating continuously at 12 ms^-2. In the back there are two baloons: one is filled with He (lighter than air) and attached to the floor by a piece of string; the oher is filled with C02 (heavier than air) and hangs on a peice of string from the ceiling. Describe the behaviour of the ballons as seen from inside the van.

Does anyone know any good books or websites that explain gravity and electromagnitivity well?

Hello everyone, I am looking to replicate this experiment with my Dad as a project for the summer vacation: WMV Movie File of the epxeriment this experiment seems to be extremely cool! i am especialy intrested in the 'fingers' created during the end. it shows the apperance of Faraday Waves in cornstarch. i have several questions: -in the video the there are some variables: f=120 Hz a=25g (it goes from 0 to 25 along the video) what do these variables mean? i am guessing that the cornstarch is being shaked by some device that shakes it up and down, am i right? where can i get such a device? is this an example of what i'm looking for? …

What is the net force for a man (1kg)in a lift falling with a speed of 12m/s2? [MATH] \Sigma F_y=F_n-mg [/MATH]??? Is the gravitational force considered as external force?

Hello, I am here to seek for an answer for my question. In general, if a lift is disconnected with the rope, it falls with the acceleration about 9.8 m/s2. If a man is inside, he will fall at that acceleration too. I know that calculation [MATH] F_n = ma+mg [/MATH] That states that when a=g, the two objects cannot touch each other, so there are no normal force. 1. What is observed if a>g? It is known that the normal force and the apparent weight are negative, what does it mean? 2. What's the normal force? I do not totally understand this word. I think it's action-reaction force. The reaction force but I suspected why there are no movement by the obj…

Background: Werner Heisenberg conducted an experiment where he captured a photon between two mirrors. He calculated the time it took for the photon to travel from one mirror to the other. He then moved the mirrors along the x and z axes so that the photon traveled a greater distance between the mirrors, and found that the photon took the same amount of time to travel between the mirrors. Question: Does this mean that the speed of light was increased?

Which is more dangerous-alternating current or direct current? Is direct current only found in battery circuit but not the circuit which electricity come from power station?

I saw a few minutes of Jeopardy tonight and one of the questions had an answer along the lines of the following: A pendulum takes longer (or was it shorter?) to make a 360o rotation the nearer it gets to the equator. My question is simple: why?

Let there be a point where only space and time exist. Let that be the only point that exists. Let there be a point where only space and matter exist. Let this be the only point that exists. Lets say a link was made between the two Universes. Let this link allow sharing amongst the two points. Lets say due to the new elements presented to the two points energy is created. Would this new element stretch the time and space amongst the two Universes?

When we measure specific heat capacity of a substance(liquid), simply we put a heater(made of metal) into the liquid. Then we turn on the power in order to let the electricity passes to the metal. At this moment, the metal heater get heat and conduct the heat by conduction to the liquid. Lastly, energy involved in the process is measured by the joulemeter. Then I think, doesn't the metal take up the energy as some energy would finally (from electric) stay in the metal heater, then why don't we measure it? If the finally T for metal is 150 degree Cel from 50 degree cel and the water first is 50 degree Cel and finally 100 (liquid). Then the energy absorbed by t…

Hi Hi, this is my first post here. Which of the following freeze into ice first when they are put in refrigerator, a cup of cold water or a cup of hot water?

Do atoms or molecules of different compound have different speed (kinetic energy) when the temperature is the same? If they have the same mass?

Is it possible for an earthquake to be defined as linear/non-chaotic phenomena? sorry for the weird phrasing, i'm not a physicist.

How to prove 1/f= 1/u +1/v?

I have a question on Maxwell?s equations. I understand that one of the experiments that confirmed Maxwell's equations was performed by John Rowland about 100 years. It consisted of measuring the magnetic field produced by a gold plated disk that had been electrostatically charged and was rotated at a high RPM. The idea was that the rotating disk was supposed to approximate a current moving through a circular loop of wire and thus produce a magnetic field. The problem is that there is a theorem that states that given a right circular magnet placed in a box and rotated about its magnetic axis it is impossible to determine if the magnet is rotating …

Hi there folks, I am deperate to find out why if you have a container of water which has tiny holes in the base does the water not flow through it? Is it because the pressure of the water above the holes isn't sufficient to push the water though? If you can imagine the base of the container has holes a tiny bit smaller than that of a shower head. Is there a scientific term to explain this phenomenon? Please can someone help with this. Leon Aitken