Physics

Gyroscopes demonstrate an unusual force. It is the same force as makes spinning tops work. Instead of being a force in a set direction (like a fan) or towards a point (like a planet) it is a "keep upright" force that keeps the spinning top from falling over. There is apparently more force created with a heavy and fast spinning object. Therefore I propose an idea for a small device that contains a very heavy spinning disk housed in some sort of casing. When the device is on the disk will spin very quickly always being accelerated by some form of motor (until it reaches it's top speed). The device could then be attached to the outside of an object to keep it upright. …

Hello. We are trying to understand Physics of this new VAWT turbine device on Youtube: Video removed by moderator How air flow does work like this at this high rotation speed? It say "Wing turning with Aerodynamic Lift-Force" in text description but it is some kind of wind vortex used maybe? How vector the air pressure through it to keep so stable in fast wind? Is there Academic paper which explain aerodynamics simikar like this? We only find papers on rotating animal and insect wings so far. Thank you - Ahmad

It's said latent heat of boiling water or steam will cause more damage. I find that when I cook and the water is boiling, if I put my hand near the steam I wouldn't get as much pain as I accidentally put my hand directly into the boiling water. I would probably hold on a few seconds under the steam but if I put my hand into the boiling water I won't be able to withstand one second. Why is that?

Without doubt, white color should reflect sunlight while black color should absorb it. It's cooler to wear white clothes. How about protection against sunlight? It's said black is better because more sunlight is absorbed so that it won't reach our skin. I am confused, white color should reflect sunlight away from our skin, isn't it better?

If an object contains more electrons than protons it will become a negatively charged object is that right? Two questions here: In practical situation, how to make an object slightly negative charged? If I simply put a USB charging cable designed for mobile phone (connected to the mains) is it enough to make an object negatively charged? When an object becomes negatively charged, how will it end up? Do the electrons stay in the object long time or forever or do they go into air? or do they go to the ground?

There's a match in the physics' constants: h = k.q.c Does anybody knows the reason? h = 6,62 x10^-34 J/s k = 1,38x10^-23 J/K q = 1,60x10^-19 C c = 3,00x10^8 m/s These are the values with precision of two digits but the matching seems valid for any quantity of digits. Nothing appears in a google search...

This thread is aimed particularly at @hoola and @bangstrom It took from the mid 1600s to the late 1800s to appreciate the full significance of this difference and even today it is rarely brought out in courses. When schoolboys move up from the algebra of values eg solve x+3 = 8 to the calculus they are introduced to 'functions'. But few, if any, are taught that functions have an algebra of their own. And this algebra is different (more complicated) from the very simple algebra of values they have become accustomed to. The function and its derivative (short for derived function) have a particular property that they exist (mathematically) w…

Only differed by frequency, wavelength but they are all fundamentally done by light, is that right? When you put a physical credit card or stored value card near a payment device provided by the merchant, is it using the identical technology as that when you put your mobile phone close to the device and pay with your mobile phone without physical card?

Is there any alternative to nuclear energy? Long term, nuclear energy creates more problems than solutions. For many decades mankind has been trying to develop more efficient way of producing energy and tackle nuclear waste. Many scientific teams around the world hope to make some progress in this area. Billions of taxpayers money are being pumped into the research every year. Is there any chance for nuclear fussion technology to power our homes and businesses in the near future? Is there any chance for nuclear power plants to become obsolete? I want to start a serious discussion here about our future on this small planet. This thread is especially dedicated to thos…

Couldn't an extremely large concentration of neutrinos, for reason's unkown, explain the observations that leads to dark matter? Perhaps there are regions in space that trap's neutrinos, like a black hole does with light?

This is going to save people's lives you all please share it no advertising please in another forum I got questioned why I post link to a web page. I can't post all of it here. if the google page is not ok you can download documents from here: no advertising please

Hello. What is the table I should look for to find which materials have the capability of holding/storing more amount of heat ? I do not care how fast they conduct the heat if their parameters are related; and what is it called ? specific heat ?, density ? specific gravity ? , heat conductivity... Example : 1 Kg or iron at 100C or 1 Kg of water at 100C or 1 Kg of concrete at 100C or 1 Kg of wood at 100C... And does it go by mass, or by volume ? As in 1 litre of iron, 1 litre of concrete, 1 litre of water instead ... ?

Good morning. Had 3 spare solar panels dormant for months; decided to put them to work for helping heating the house instead of sheltering spiders in the basement. Panel1---panel2---panel3-------------hotplate stove Panels are 40VDC / 400Watts each; the series yields 120VDC capable of 1200Watts at full insolation. Yes, the 'burner' gets very hot and has to be contributing warmth into the dwelling. Now; is it better to warm the air during daylight or put a pot and heat water (or rocks? or junk metal?) lasting more time into night time ? What would you do ?

Hello I struggle about this concept of time If I understand right, time is a measure unit we created to measure/understand movements right ? for example, this man is 50 yo, this man passed 50 earth/sun rotations... I mean we use time because it's easier than talking using movements only.... ? It took 7 seconds for me to drink this glass of water the glass been drunk while our planet gone from point A to point B Could we talk using movement without time ? Do time really exist or is it a measure unit we created to explain movements ?

hi, this may be a dumb question, but I'm wondering (read carefully every details) : Can we use a very strong electric field to separate electrons from nucleus of some hydrogen or helium gas (a macroscopic quantity, not just some particles, it's not a particle accelerator), then accelerate the nucleus' at high speeds using electric fields, then making them collide in large quantities... (and maybe uses the electrons at the other side to go back with nucleus at the end) and then use the fusion energy obtained to power the whole machine ? thanks

Hello all. When the switch is on, 10 Amperes flow trough it. When the switch is turned off, there is arcing between its contacts. ---------------------------------------------------------------------------------- Added resistor to circuit, consumes 0.025A tiny current. When the switch is on, 10 Amperes flow trough the switch. When the switch is turned off, is there arcing between its contacts ?

Hi. Solar radiation in all its flavors of infrared, visible light, ultraviolets and all the rest whatever they be hitting a roof for a standard figure of 1KW/m2 What device could collect the most solar energy of all kinds installed on a roof ? Photovoltaics can collect about 18% into direct current.

what if it is true???

i decided i want to try to "understand" how a plane can fly. if thats even possible for a layman like me. so ive been watching a bunch of videos, but still so many questions. and you cant ask a video anything. so, i thought i would try here. because this is essentially a tricky subject, i thought i would break it up into mini subjects. so the first subject is Bernoulli's principle. now i know this is not the whole picture of why a plane can fly, but it is some of the picture. so, first up i thought it better to try to understand this. so, as i understand, Bernoulli's principle states that an increase in a fluids speed lowers its pressure. the thing i cant find on…

In recent days I have done a few experiments measuring the current of water as it goes up from 9 volts up to 36 volts, and following Ohms law to convert it to resistance. And I discovered a very interesting trend. In between 9 and 18 volts, there is a massive drop in resistance (by around a 40% reduction) but then as I go up to 27 volts, its a 5% reduction, and is even less of a reduction when reaching 36 volts. I've done this experiment a few times and this has continued to happen. This is it visualised on a graph; I am curious to know why this happens, why there seems to be a reduction as I go from 9 to 18 volts, yet the reduction…

I am living in a subtropical region and we are in summer now. Every time when I come out from a hot bath (I never bath with cool water) and before I dry my body, I feel quite cool, but room temperature at night is still over 85 F. Is it because of the high heat capacity of water droplets on my body which has absorbed heat around my skin?

I notice alcohol easily kills houseflies; when I can hit 'em. (Yes, I finish them off just to be sure.) But they're crafty little things, and usually manage to maneuver around it, especially when they can tell I'm coming. I want to be able to spray them from far enough away that they can't tell I'm coming, but that the alcohol still hits them with enough force to kill them, or at least leave them immobile enough to finish off. Is there any way to create a stronger spray bottle than the kinds alcohol is usually stored in? (Sidenote: Yes, if I ever in the future intend not to live alone, I will ensure I get a locked safe to keep the bottle in so it doesn't fall …

Looking for all known CONTROL OF and CONTROLLED applications of the big 4. So you may say, for electromagnetism, we can create and control it with batteries, generators, capacitors, semiconductors etc.

Is there any study or research on approximately how much damaging or harmful UV could reach inside a room in an apartment building of a city without any UV film or curtain? It's said most harmful UV is already blocked / absorbed by the glass of windows or other obstacles before reaching inside. Is it validated?

Regards. Lenz law shown here ---> https://www.youtube.com/watch?v=N7tIi71-AjA How to, where to, probe, measure, confirm a voltage presence of the eddy current as in the copper pipe shown above ?