Recent content by ohadohad2

Also if I remember correctly RF antenna's are very inefficient and transform about 5% of the energy into RF wave.

Frequency = energy of a single photon = the energy an electron needs + get when he is existed. What this means is that if the work function is 1ev and you have a photon hitting the substance with 2ev then an electron will be released with 1ev of kinetic energy. Intensity= the rate of which...

You can enter nanotechnology from electrical or materials engineering too.

LOL not a rabbit, I was actually at a beach with two bi sexual friends (females) of mine, while they were doing their thing a few feet next to me I was starting at the stars, which I haven't seen in a LONG while since I live in a city and started pondering about that lol. Anyway, rocket fuel...

First and foremost I did say I'm not an expert in physics and this is just the most general description and thesis to such propulsion. Forgive me but I don't see where I break the law of energy conservation? I'm assuming the vehicle will have a power source that will supply energy to the...

Well if so, than we theoretically found a way to create a gravity propulsion engine...not an efficient one...but still :) Just think of a similar structure to a fusion reactor where they concentrate many laser beams on a single spot , if you take a spaceship and have a laser array that all...

Hmmm well this sounds a bit out of my knowledge but if I think I understand you right then by focusing at one point a very strong electromagnetic wave such as a laser beam (or more precisely many lasers beams that will all reach that point in the same positive phase) will create a gravity field...

First please bare with me, I'm not close to being a physicist. So if I combine E=m*c^2 and that mass creates gravity, I conclude (probably wrongfully) that with enough energy concentrated at the same point we can generate a noticeable gravity field. Now I know that it will require HUGE...

I didn't read all the thread so excuse me if I repeat something someone else said. By holding the ball you DON'T DO WORK BUT you DO "SPEND" ENERGY. Its exactly like an car with automatic gear on a slop, it standstill but the engine is still running and create torque on the wheels but there...

You miss the point,forget about a black hole.Just imagine you got a gravity vector as strong as the one emited from a black hole and a light beam that is traveling in the oposite direction that feels its effect,its not a word paradox its a physics one :) But you guys really helped me,and once...

I see I got a lot of reading to do :)

I see some of you didnt actualy read my post.I specificly said that we are assuming that the gravity vectors are exacly radials (for example like the E of a sphere electrical charge) and that the light is traveling excaly against the direction of a singal vector. mr.vodka got what I am...

Ok I got a question. So we know that in space light travels at a constant speed of 3X10^8m/s. We also know that light can't escape a black hole gravity field. So let's assume I got a light source just near a black hole (lets assume the gravity field is radial) ,my light source is...

You feel whatever your nerves react to,which is 99.99999999% force.Since you arent a ferromagnetic material you need a STRONG magnetic field to have a noticeable force on you.So that's why you don't feel it. Also a magnetic field can create currents and charge accumilation,but on a dielectric...

A pretty simplified way to look at it is this: When you close a circuit you have an electrical field E,E create a current in the antena. Now as you know a wire that have a current flowing in it creates a magnetic field B. P = E X B , and that's the radiation you recieve.