Just though you might appreciate this extra 'nugget' to continue to stimulate your new-found interest in particle physics. It's an explanation (that I've copy and paste from here: https://www.physicsforums.com/showthread.php?t=32834) of what is meant by the terms - "on mass shell" and "off mass...
A little algebraic short-cut would be to ignor the actual words and group the like terms.
E.g. for your example you could write: FUN + JOKE = 2H +2A
Of course this equation has more than one unknown quantity so clearly more information would (and probably was) be provided. If this is not the...
This is at best misleading and at worst just wrong.
Of course if one brings two atoms close together there will be an induced electric dipole due to the electron clouds and nuclei repelling/attrcting each other. Whilst this may be a small force for individual atoms there are of course many of...
I think SUSY would be the most accessible / feasibily one to choose, as tom says.
Otherwise you start looking at things like string theory, LQG, non-commutative geometry etc.. You'll find the details in these somewhat inpenetrable initially but it may be possible to put together a 'hand-wavey'...
It's not electromagnetic. The question doesn't state the either the hammer or the metal are charged and they should therefore both be assumed to be electrically neutral.
In early 2010 I attended this inaugural lecture by string theorist- Prof. Mavromatos entitled 'MAGIC strings'. In it he proposes that some string theory models may violate Lorentz symmetry at the Planck scale resulting in a kind-of foamy spacetime that could be observed by differing arrival...
Is this meant to be a joke or a hint at the solution?
It did make me consider whether they expect the student to realize that to come to rest the diver would have to be neutrally bouyant in order to properly come to rest under water.
Downward force due to gravity = mass x gravity = 72 x...