Classical Physics

I had an idea recently. I tend to drop man small metal components and instead of looking for them i would prefer to just flick a switch on an electromagnet. so how would you build an electromagnet capable of picking up small metal components from 5-10 feet and what would such a magnetic field would do to nearby technology ie (cellphones laptops or their signals)

It's an idea which has been in my mind for years; the idea of using shiny gloss paint for road markings. It's fresh in my mind again as recently, a friend of my mother was killed in a road accident because she could not see the road makings. The road in question is renowned for being an accident black-spot. It forms a sort of 'Y' shape, where people coming from the top-left of the 'Y' don't realise that they must give way to those coming from the top right. People crash into one another because they think they're just driving along a normal stretch of road with a slight bend in it, unaware that another vehicle is coming to hit them in the side. So…

In math and physics class i learned about secant and tangent lines(?) i was wondering if this had anything to do with trigonometry honestly, i don't really know what they are so confusing

a wind blows at 25 m/s over your house, what is the net force on the roof if its area is 250 m^2? help would be much appreciated

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Can someone explain what the difference is in taking the derivative with respect to P of PV=nRT vs V=nRT/P ? T is kept as a constant.

So basically, I have a question to ask about the ending of this film. The relevance of the clip I included starts at around 3:40. So the story pretty much is, that he spins the top (called a totem in the movie), and if it falls over, he's awake. Conversely, if he spins it and keeps spinning forever, he's stuck in a dream. My argument is that since the top appears to start wobbling at the end, it will at some point in the future fall over, correct? Once it loses that perfect balance it initially has, it will stop. So he has to be awake. Is there any flaw in my thinking, provided that tops behave in Inception like they do in the world we live? Edi…

Photons, electrons, and I think many other "things" in quantum mechanics are said to be both particles and waves. I'm wonering, does this happen as a regular "timed" cycle or is this cycle of transformation irregular and unpredictable? And does anybody know why this happens or what event/s might cause this phenominom.

If electrons exist as standing waves in an atom, how: 1)is the region of probability denity stay fixed? 2)does the electron not crash into the nucleus? 3)does the overall energy of the atom stay fixed? 4)Newtonian physics fail in explaining atomic mechanics?

We know this conversion factor well. Then, is the efficiency about 100%? How do we prove it?

A plank is fixed between two rigid supports. A load of 50lb is placed at the midpoint of the plank and it bends by 2 inch. How much will it bend if a load of 75lb is placed at the same position? How much load is required to bend it by 3.5 inch?

Picture a sphere, the outer and inner shell are made of absolute reflective materials, with a fiber optic wire at one point on the sphere. It has a "stopcock" to stop the transmit of light into the sphere. If I send in light signals into the mirror-walled sphere through the wire, and close the stop cock after one minute, would: 1)The light signal continue reflecting in the sphere forever, provided that there is no outside influence, and the reflective material has absolute reflectivity, no light is absorbed? 2)The light signal be the same if I let it out through the fiber optic again? 3)I be able to store light?

In this Thread I would like to only discuss the diameter of the Universe! First off I would just like to state it is just a wild hypothesis that I came up with while I was bored. Now I might be way off and I'm not taking into account alot of other factors but my logic seems very logical. Now lets get to it. I was watching a video called "Closer to the Truth" and scientist were talking about how big the universe is and no one seemed to know with absolute certainty. After watching that video it just occurred to me that if the Big Bang Theory is true, then whatever caused it sent out light in all directions. So taking that into account we can known the origin of li…

when a flame emits light, does it emit it evenly, or it the light more concentrated in some directions?

Hello, I am trying to re-invent the steam engine. Is there a way to use volatile chemicals to create gas expansion, that is cheaper than boiling water to produce steam? Thanks for your time and consideration.

Measuring is important for experiment. Gold 1.000 g measuring is easy. But above seven zero range measuring is not easy. How do we measure this mass by using instrument? And, which parameter should we consider?

Vessel 1:- I have a cylinder, full of water, with a volume of v. This cylinder has a full sized door at the bottom of it. I understand that if the door is opened the the force of water pushing downwards is the weight of the water in the cylinder. Vessel 2:- It is cylinder with a cone on the bottom of it. Part of the cone has been cut off to create an opening for the water to come out but a door is attached. The volume of this vessel is also v. Question:- If the door of the second vessel is opened does it still have the same force of water pushing downwards?

Hi all! My name is Anne and I just joined the forum, I’m a new comer to Science. I’m still trying to understand it all and our little company (just me and my son) is still navigating through all the different ways to approach the industry. It’s a tough economy! I was wondering – for those of you involved in the industry (especially veterans) business owner or not, what are some of services, tools, strategies, or latest resources you find helpful or profitable in doing your work or - business? Online or offline, I’m sure there is quite a lot in both right?! Thanks and God bless!

why current decreases while charging a capacitor?

It appears that gravity is actually a pretty lousy mechanism for storing energy. Could someone check/correct my logic here? Assuming that an average house weighs about 110,000 kg (got this number from yahoo answers). This means that if you raised this house by 1 meter, you would be "storing" 110,000 Joules? (I get confused by the time element here). If that's the case, and if you were to allow the house to settle the 1 meter over the course of about 8 hours, you would get back roughly 30 Watt Hours during that time - or enough to power a single 100W bulb for the duration of the sinking house. That seems incredible to me. Did I do the calculations right? …

hi all, im searching for a simple online energy convertissor, would some one help with useful links, thank you.

If the Klein bottle was made of a conductive substance. How would an electrical charge behave on it? Remember that hollow conductors have charges build up on the outer surface.

At the top altitude of the Earth the gas concentration is very low. In that area how do we measure the temperature? I think very small number of the molecules collide with the sensor of the instrument per min.

Hey, I'm writing a book, and in it there's a sort of substance in it that's neutralized by bright light. Recently I heard about lumens, the unit of measure for light, and I was wondering if anyone knew about how lumens scale... Like, if something has twice the lumen level of something else, would the radius of the circle of light it cast be twice as big? How many lumens would a fire-lit torch have? A candle? A Heavy-duty flashlight? The sun by the time its rays reach the earth? A massive bonfire? I'd really appreciate it if somebody could help me out with this.

I don't understand this, the potential energy explanation of gravity says that if i drop a rock it's energy is converted into kinetic energy of motion as it falls, so that the higher up it is released the more energy it has kinetically when it hits the ground, both balance out the potential and kinetic energy so that no energy is created or destroyed just converted from one form to another, makes sense... but my question is when the rock hits the ground and stops, gravity still affects it right at the atomic level? Does that mean it's still falling on the atomic scale? Creating pressure thereby heat?