Classical Physics

What's the difference between a solid and a liquid, according to time? A body can behave as a visco-elastic plastic, so it's neither a solid or a liquid, only one or the other, depending on time? Rocks flow over time, at an instant they are a solid, but over million year time-scales they behave as liquids.

after getting a plasma ball to help with electricity for as physics, i found it interesting that the static electricity outside of it could disrupt my laptop and disconnect my usb devices, i was wondering is it possible to get the electrical jumps inside the ball or the statics outside it and turn it into useable electricity using say metal disks inserted inside and connected to a transformer.

Hi. As the shuttles, when returning to earth have to dissipate its enormous kinetic energy by counter propulsion (expensive) or braking trough the atmosphere; what if the orbit is geostationary ? Would then a tiny impulse towards earth to start falling from orbit and then a parachute suffice ?

How do I calculate the amperage of the shock received from an electric fence with the following specs? The controller specs: Voltage: 12 volt DC operated Current Draw: 0.067 Amps Output Pulse period: 1.280 Seconds Pulse On Time (Electricity flowing): 0.000072 Seconds Time between pulses (Off Time): 1.279 Seconds Peak Output Voltage (No Load): 11,400 Volts Fence Load Peak Volt Pulse Energy (In Ohms) (in Volts) (In Joules) 2,000 6,560 0.27 500 5,040 0.57 300 4,160 0.60 200 3,360 0.58 100 2,160 0.49 50 1,200 0.34 I tried converting the Pulse energy in Joules to W…

Hello, I want to create H+ ions (protons), and release them into the air, by means of a device I can build myself. My questions are 1) Can I make a device, at home, that is able to create H+ ions (f.e. out of water molecules) and release these into the air. 2) How would I proceed in doing so? Thanks.

Hello everybody, I am currently working on a science project and have reached the point where I need to measure viscosity of various fluids to a point of acceptable accuracy. For this I need to construct or buy a viscometer to do this. Does anybody have any suggestions on what type I should construct/buy. Note: I do not intend to spend a lot of money on this device unless necessary. Thanks for the help.

I understand that rubbing a glass rod with silk leave the glass rod with a positive charge and rubbing rubber/PVC rod with fur gives the rod a negative charge. So if you wanted a rubber rod to become positively charged would you rub it with silk? Why do some materials accept electrons better than others as in the case of silk and fur?

Would anyone know if there is "new" work going on with respect to classical physics? To further clarify that question, let me explain that I'm sure there is work being done to (as Kuhn would say it) further articulate the paradigm. You know of what I speak. Someone writes a paper on the general stress in flat plates. Then someone writes a paper on circular plates with fixed edges. Then someone writes a paper on circular plates with fixed edges supporting a tabby cat. Then someone writes a paper on circular plates with fixed edges supporting tabby cats with a cold ... that's not what I'm interested in. I'd be more interested in work related to classical-quantum cor…

Maybe I actually am a little stupid, BUT, surely to god, humanity has the most efficient and pollution free fuel in the form of water? ie. H2O. Or perhaps all the Oil companies just buy up the patents on ways to efficiently split the molecule apart?

Viscosity is measured in SI units labeled: kg/m s (kilogram per meter second). Can anyone clarify what each separate unit would represent. All I can get think of is how much the liquid resists movement; so does this unit represent the force that it resists with? Any help would be appreciated.

I had one of the big versions of this when I was a kid, but I wanna find the name. please help

what would be the potential current traveling through a Gasseous metal such as iron?

I'm looking for a bit of guidance with this problem if anyone could help please. I have a 'leaky' capacitor 100pF parallel plate with a 'mica' dialectric of relative permittivity Er=12 and resistivity p=10 to the power 14 ohm/m. Ineed to calc the leakage resistance? I know the Er value for mica is 7 so the value of 12 is probably due to it being 'leaky' but i am just unsure of my next step. any help would be greatly appreciated thanks Paul

Why does a pot vibrate on an induction plate? (I know how an induction plate works, so skip that part.)

If an image is reflected by a surface which bends according to a particular function, can one, based on this function, know how the image is deformed, and reverse the deformation? How? (Formula etc.)

regarding the equations of bending moments in elasticity suppose we have a beam of length l fixed at both ends. at a disttance x from a fixed end o there is point c. regarding equilibrium of the length x ie oc we ignore the reaction force acting at the end other than o. why? if the beam is fixed rigidly at both ends then we take the reaction couples into account but if placed on knife edges it is not taken into account why? can anybody suggest me with books on general properties of matter in university level, bachelor's honours. thank you in advance. Merged post follows: Consecutive posts mergedplease suggest good books that would be available in India.

Can the suction of a household vacuum create static electricity? I have heard this and I would like to know, not only is this true, but how and why? You see many people clean their PC fans with a can of compressed air. I think this is the worst way to clean a PC fan. My idea is this will only scatter the dust and much of it will fall back into your PC and get in all the nooks and crannies of the motherboard. Many times if you attempt to spray a CPU fan with a heat sink behind it, all you will do if force dust between the grooves of the heat sink making matters much worse. ( unless you actually take the fan and heat sink out so you can get to the underneath) …

I would like to do some experimenting with some superconducting YBCO toroid disks measuring about 2" in outer diameter, 1" inner diameter, and 1/2" thick. I've tried to search for a price list on the web with no luck. I even tried Ebay. I hope they are not terribly expensive as I need 4 of them. It would be great if the sizes were close to what I have stated. Thanx-

Meteorologists have been quite right in associating graupel (sort of a flying slush) with lightning. Those two manifestations of atmospheric electricity share microphysical phenomena that contribute to conversion of heat to electrical energy. Heat is absorbed in the conversion of liquid water into water vapor. With the evaporation process, the absorbed energy becomes invested into increased molecular velocity whereby gaseous state is achieved by bringing water molecules into mutual escape velocity. Such vapor eventually absorbs atmospheric ionization, which lowers its dew point temperature. Electrical repulsion reduces intermolecular attraction to thus require additional …

I got this question sent to me: An 2 kg mass object is held by a spring balance in a liquid of density 1200kg/m3. What reading does the spring balance show (in N)? So i wanted to cheak my that i was doing it properly can somebody cheak what i did and say. This is what i did. Weight = mg Weight = 2*10 Weight = 20 Upthrust = Density of liquid/ Density of Solid (mg) So: Density of solid = Density of liquid (mg) Denity of solid = 1200*20 Density of Solid = 24000 Apparent wieght = mg (1- density of liquid/density of solid) = 20 (1- 1200/24000) = 20 (1- 0.05) = 20*0.95 = 19N Is that right?

(firstly not sure if this goes here but if it doesnt then please move it) I was set this question by somebody and i have not been able to answer it. I have a rough idea what the answer is but ive not a clue how i can prove it. Does anybody have any help? Here is the question: A person stands on the sidwalk when he/she hears the siren of an ambulance which approaches with velocity V. The ambulance passes in front of him/her and continues its way, getting further and further with the same velocity V. Let f1 and f2 be the frquencies of the siren heard by this person when the ambulance is approaching and when the ambulance is getting further respectively. If f0 is…

This was performed in my high shool Physics class. I have contacted the show. You seen it on All In The Family, The Honeymooners, and even on Bill Nye the science guy, and performed in grammer school science classes. This practice of lifting a chair 3 steps back from the wall was passed off as medical fact that a womans spleen was stronger than a mans because she is designed to have children. This was a trick created by a woman. If a man & woman are the same height, the mans feet are longer, this creates a greater space between the wall and the body compared to the woman, so when he backs up 3 steps, he is on his tippy toes, compared to the woman who is flat …

Is an alpha particle the most electronegative chemical entity possible? Electronegativity is a chemical entity`s affinity for, or power to attract electrons. An Alpha particle is 2 protons and 2 neutrons fused together. It is exactly the same thing as the nucleus of a helium atom. I think it is. Because it requires 2 electrons to make it an electrically balanced atom, and there is that force that compels atoms to fill their outer electron shells. This is refered to as the octet rule,which in this unique case would be called the doublet rule perhaps. Also this outer electron shell is the first shell,placing the electrons closest to the protons as is possible. What is…

regarding equations of anharmonc oscillation while solving we 1st ignore the anharmonic term say ax square. then we put that solution in the equation and try to solve it again. i dont understand how it reduces the error? please explain.

Hello there im currently doing a project which involves Magnetic Suspension, since i have limited experience and little knowledge on this idea, i'd like to ask some questions which can come up in my Project Specification. My intention is to replace who torsion system of a car (torsion bars, springs etc) and replace it with Magnetic Suspension. I have to consider different variables that can change in magnetism i.e the strength of a magnet or distance between each magnet. Im about to ask some questions, now that you know what im doing i'd be grateful if you can return your answers with solutions. 1. Can i create torque (rotary force) using magnetism? 2. Can i …