okay but what'd we get if we calculate the energy due to equal and opposite charges?should it be positive or negative?according to the formula statrd above,it'll always be positive.and using the formula [k(q1)(q2)]/r,it's negative.can you please justify how?
I'm following the book ''introduction to electrodynamics by D.J. Griffiths''. As he has written that the formula ''integral of product of infintesimal volume with the square of electric field'' gives us the energy contained in a charge configuration that is always positive because we're...
we can't say that necessarily because simple harmonic motion is caused by a force which has a restoring effect and opposite to the displacement.so all the terms may get added and may give a positive value which is ofcourse not the hall mark of SHM.
But do we've any relation between x(equilibrium) and x?i guess no.then how can we say that x'd be executing SHM in ground frame.i'm sorry but I din't get this point.
hmmm..i agree.Equilibrium position is fixed relative to the elevator.And if elevator's acceleration is g relative to earth,then equilibrium position should also have an acceleration g relative to earth.right?
And one more thing,we only know the elevator is falling freely(given) and the spring is attached to the elevator.so at that point spring's acceleration too should be considered g only.do u agree?
First of all I'm sorry.i''ll try not to use abbreviations anymore.anyways,yeah the equilibrium length is fixed because when the elevator was fixed in space,block was also at rest.means the downward acceleration was then 0.so mg-kx=0 and x=mg/k and x is actually x(equilibrium)(I don't know how're...
the position of the equilibrium of the spring is not mentioned in the questions.the only thing mentioned is the elevator starts falling freely means tht ceiling of the elevator has an acceleration g in downward direction and we can't even say that the block will also freely fall.bcoz then it...
okay,i try.for the block if we consider the acceleration a of d block downward, and if the elongation is x of d spring.then the eqn probably looks like:mg-kx=ma
one more thing we can do is to split this x into two parts as tiny tim said,x1 and x2 so x2-x1 =x if it works.x1 is d compression coz...
yeah i agree with you.bt how'd we show it mathematically?writing eqn for the block:mg-kx=mg will bring absurd results.what about this?can you guide me through solving my problem frm ground frame f reference.i'd really be thankful to you.
ok,can we be sure it executes SHM?i mean why does it execute SHM.when it's falling freely,the block is accelerating downward only because of the weight of it and the spring force is only applicable when it's stretched.so I assume that it's stretched initially,as the ceiling is also coming down...