Recent content by esmeralda4

The person is pushing the object up the ramp at an unknown angle. Presumably I would use Work Done = Force x Distance but do I just use the length of the ramp or do I need to take the height into consideration? Thanks for the reply

Homework Statement If someone is pushing an object up a ramp 2.6m long and 1.1m at the far end how do I calculate total work done? I know the force needed to push the object is 220N. Homework Equations Work Done = Force x Distance The Attempt at a Solution Do I do 2.6...

Hi there, I'll come straight out with this, I'm really struggling to understand the conservation of angular momentum. A common example involves someone sitting on a rotating chair holding a rotating wheel. If the wheel is held so that the axis of rotation is vertical then the person...

Thanks for reply. But considering the alpha particle that is formed. Why do the nucleons within the nucleus get even closer together to for an alpha particle with higher binding energy? And why does this not happen in a small nucleus? Thanks

Hi there, When an alpha particle is formed inside a nucleus by binding together is this essentially nuclear fusion occurring? Why is this more likely to happen in a large nucleus than a small one? Thanks

Since we can observe gravitational lensing and conclude that mass can affect the path of EM radiation it seems logical to me to assume that EM radiation will exert a slight gravitational attraction of it's own on a mass,- although I do not recall ever reading about this. Presumably the...

Hi there, I understood that heavy elements could only be formed in stars or supernovae explosions. However I have just read that plutonium can be made by firing deuterons at uranium. Now uranium is a smaller atom than plutonium so what it going on? It seems to me that heavy elements can be...

Hi, Since velocity is a vector quantity I assume it follows that KE must also by a vector since KE=1/2mv squared. Is it true to say a rotating object has zero total velocity since + = - and therefore the total KE is zero? Thanks

Hi there. Just a few quick questions: What causes a photon to become an antimatter / matter pair? Is it just random? Can a photon be influenced to encourage it to change? Also what is the process called? Do we say the photon has decayed? That doesn't seem right to me. In addition, if...

Hi. After Beta minus decay does the atom gain a charge and become an ion? I.e after a neutron become a proton and electron does the atom become positively charged because it has more protons than electrons? Or does it capture an electron from somewhere else? Thanks

Excellent. Thanks for the recommendations.

Hi there. Just been reading about Voyager 1 and it's current progress. Wow. Totally incredible. I mean this is seriously a contender for mankind's greatest feat of science and engineering, isn't it? Anyway. I want to read more and in a book - not on the internet. Can anyone recommend a...

Hi. I'm currently reading 'The Goldilocks Enigma' by Paul Davies. In it he attempts to explain some areas of Quantum Mechanics in laymans terms and writes... "Quantum randomness, by contrast, is irreducible, which is to say that quantum processes are in some sense genuinely spontaneous -...

Ok, just been reading about virtual particles. Just how complicated does the Universe want to be anyway? If I was to design a Universe I would probably have, like, two particles and maybe only one force and they would all be visible to the naked eye. And I would have non of this virtual...

Thanks for the reply. So are there any Higgs Bosons zipping around or have they all decayed at the beginning of the universe? With the magnet comparison doesn't the magnet give of exchange photons when it is near another magnet or magnetic material? Or have I made that up? What...