Recent content by japam

well,let me change the question to: ¿how can you differentiate an image from a distant object ( ex a tree) taked with a telescope, and an image of the same tree taked with a normal camera but taked from a near distance , in such a way that the tree image size in both cases is the same?

A telescope takes an image of a distant terrestrial object,lets say a tree, and amplifies and broadens it; however i ask myself if is not posible to build with some combination of lenses an apparatus where you will see an image of the distant object as IF YOU WERE NEAR OR CLOSE TO IT, this app...

my preliminary calculation was, suposing the plane was already in the air, and a watt= 1 joule per second,then you calculate how much falls a mass in 1 second , its aprox 5 m,hence the energy to maintain plane is equal to potential energy to lift to 5 meters, ; supposing the mass of the plane...

Im trying to calculate energy of the turbines to lift an airplane , by this way, calculating potential energy necessary to lift mass of the plane to an height of, let's say, 2000 meters , ,supose it spend 1 minute in reach this altitude, it gives me a result of the order of 1 megawatts of...

. Do you have the data about how much is bigger the mass loss by solar wind than for nuclear reactions? Regarding my first post, i guess that astronomers made theoretical models and then calculated 4 million tons/sec of mass converted in energy, but my question is that this number can be or...

From nuclear theory and texts its known that every second 570 millions tons of hydrogen are converted to 566 millton hellium,hence Sun loss 4 mill tons of mass in a second. But ¿how do astrophicisist probe experimentally this number?,have they measured solar gravity field or Earth atraction...

Is the same inductance formula valid for a coil made of hollow tubbing that for a solid wire made , with both having the same width?, and supposing that a high frequency current flows through it whats the skin effect influence on the result

My question is related to black holes, well there are many books and writings that explain what a black hole is and all AFTER collapse but i have seen few that explains the BEFORE collapse; exactly how is that matter can be squeezed to an infintesimal point, ¿what effects could one expect to...

Hello all Just a simple question that intrigue me recently. Some body could explain about how scientists exactly know that transuranium elements cannot be produced naturally in the Universe? JPAM

Some time ago i posted a question about what happen with a supernova ocurring on a distant galaxy that was recessing from Earth at relativistic velocity, and the conclusion was that a distant supernova has a light curve much more slower than a nearby, but then a new question arises to me...

someone knows how eddy currents in transformers are produced? by friction , resistance or heat transfer? i mean the classical example is the wheel that is braked between the poles of an electromagnet, but how this applies to a transformer where there is exactly the opossed, a fixed conductor...

suppose an imaginary fireworker that launch a rocket at c/2 velocity, the rocket is programmed to explode at T seconds with a brilliant light the fireman has a powerful telescope that let's he follows the rocket path my question is :would he be able to see the explosion through the scope and...

i have always wondered how do the sensors meters carried in spacecraft s work in space, with all that harnessing radiation out there, how is that the cosmic rays, ultraviolet, x rays etc... don't fry it out

virtual meson are not supposed that , for example, the strong force is originated by the Yukawa virtual meson (originated from neutron and protons), that attracts the protons in the nucleus in such a way that they appear atracting one on another? or this is a too old version that has been...

no paradox with length contraction? suposse that the galaxy is moving at velocity c/2 from us and that certain event happens T years after galaxy birth (a supernova explosion , for example) if the explosion is being seeing right now, then i want to know how the Alien and astronomer calculate...