Recent content by Good4you

USDOC Radio Frequency allocation table (http://www.ntia.doc.gov/files/ntia/publications/2003-allochrt.pdf) lists part of the radio spectrum as "Audible." Radio waves are electromagnetic (e.g. light), while audible waves are pressure waves in a medium (e.g. air.) They travel at very different...

Put more simply: If you think of a turbo as a stand alone system it is essentially two fans connected by a shaft. It converts mechanical energy from exhaust gas to mechanical energy for the intake. The system must have a net loss or it would be an impossible perpetual motion machine. How does...

I have a general understanding of how superchargers and turbochargers work; however, there is something that I have always had a hard time conceptualizing as a physics problem. Super/Turbo chargers add horsepower. This makes sense as they essentially cram more fuel into the combustion chamber...

Well I already bought a battery booster, so I suppose I could use that to help with the charging issue Baluncore described (thanks for that by the way, I was not aware.) The installation would then be like option 6 instead of 5. I am re-thinking this installation though. To avoid the third...

So are you saying a good experimenter should not think through the experiment? Half the fun is over thinking it, you get more time with your hobby than just your actual time doing it. That is why i had option 5; which is what i think am going with. I agree, this a problem, hence the post...

I have a 75w 2meter mobile transceiver (Yaesu FT-2900R – 13.8 volts DC, 15 Amp max draw, min draw is .3 A-.7 A ) that I would like to use in a camp type setup. The power source will be Two 12volt batteries (not dedicated) on a small enclosed utility trailer, which will be 20’-50’ away from the...

...also to clarify i should probably say that liquids are typically safer only for certain situations as stated above like in pipe testing. This allows you to use something which is roughly at room temperature, and pressure. Obviously CO2 in a liquid state is more dangerous when compressed to...

Anything under compression stores energy and can be dangerous. If a pressure vessel ruptures it can be lethal. Gasses are typically more dangerous as they are more easily compressed. In construction when at all possible pipe systems are tested for leaks using a liquid instead of a gas, because...

I had a similar question on here; which was answered well. https://www.physicsforums.com/showthread.php?t=320913 As i understand it: The short answer is that you can escape the gravity of an object by "climbing" at less than the escape velocity. (Though i suppose without some velocity, at...

Does this have something to do with the difference between watts and volt-amps? That is, changing the power factor to increase fan speed? Sorry if that didn't make sense, power factor is a component of electricity i don't really understand, and Wikipedia isn't much help.

I thought there might be a difference, could you elaborate? When people ask the difference between volts, amps, watts, etc. i usually give a response something like: I've always thought i was somewhat incorrect in regards to Amps in this response, or was missing something. In particular...

hmm. interesting, that works too. My equation had a typo as well, let's try again. A=Tan^-1(Y/X)+sin^-1(R/(Y^2+X^2)^.5) X=16.5 Y=.75 The Tan portion of the equation is for the leftmost angle of the red triangle, and the sin portion is for the leftmost angle of the blue triangle, also...

Being someone that is interested in physics, and cares less about biology, its odd to say this but... It seems to me one of the greatest scientists would be someone that greatly advanced a field to provide better human living, and their discoveries would not be easily discovered otherwise...

arg, figured it out, it was easy: L=((.75^2+16.5^2)-5.25^2)^.5 A=Tan^-1(.75/16.5)+tan^-1(5.25/(.75^2+16.5^2)^.5)

I guess it has been too long since i have had to use any math beyond arithmetic. I am working on fabricating some tube work, and these similar shapes keep coming up. I keep thinking i can calculate them out, but for some reason i always get stumped and feel like i am missing some information. I...