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  • 6 votes cast
Apr
29
accepted Doubt on series springs
Apr
29
comment Doubt on series springs
ok, I think I've got it.
Apr
25
awarded  Curious
Apr
24
comment Doubt on series springs
Uhm but why would it move to equilibrium and not towards some other position? :/
Apr
24
comment Doubt on series springs
Ahhh I think I'm going to understand!! But 1) what is the center of mass if there's no mass? 2) why will the system go to a position that would imply the abolishment of net force? Thanks again!
Apr
24
comment Doubt on series springs
uhm, ok :| The last clarification: when you say different forces at the ends implies acceleration of the spring you're applying Newton's Laws to the spring, as if it was a single rigid object, such as a rod... I can't understand why two ends of a spring, not rigidly vinculated, cannot accelerate one respect to the other.. Can you help me? thanks a lot!
Apr
24
comment Why do joined massless springs, act like a rope under tension?
I've stumbled across the same problem and it's driving me crazy: just a clarification.. with the first equation you apply the Newton's Laws to the spring, as if it was a single rigid object, such as a rod... I can't understand why two ends of a spring, not rigidly vinculated, cannot accelerate one respect to the other.. Can you help me? thanks a lot!
Apr
24
comment Doubt on series springs
There's another thing I'm not sure about. You talk about "the" elastic force of the spring that is the same throughout the spring. But I was told that the elastic force is directed towards the centre, so in the ends I have to draw two opposite vectors.. Where am I wrong? thanks again!
Apr
24
comment Doubt on series springs
I'm sorry, I don't completely understand this thing. Let's consider one spring attached to the wall. In the end gripped in the wall there's 0 net force (the wall balances the elastic force) while if I pull the mass on the other end and then I let it free, the end attached to the box feels a total force different from 0. This isn't a problem because actually there's mass (the box) between the two points. Am i correct? Now, let's suppose that the box has zero mass. Then it would accelerate with infinite acceleration and this is bad.. right? Thanks a lot for your support!
Apr
24
comment Doubt on series springs
so the important point here is that massless points (such as the conjunction point between the springs) can't accelerate, isn't it? and this is valid for that point (but also for any two points without mass in between), not just for the start condition (springs at rest) but throughout all the motion.. am I correct?
Apr
24
asked Doubt on series springs
May
20
awarded  Notable Question
Oct
8
comment Understanding basic quantum mechanics notation
@Danu the only thing that I know about Hilbert space is that it is a generalization of the euclidean space.. Doing bra and ket on O is equal to doing a matrix product? Thanks for your help!
Oct
8
revised Understanding basic quantum mechanics notation
deleted 1 character in body
Oct
8
comment Understanding basic quantum mechanics notation
which is the algebric meaning of doing bra and ket on the middle term? what is the middle term (the term between | and |)? a matrix? what do I get in the end? the value of energy due to the magnetic effect?
Oct
8
asked Understanding basic quantum mechanics notation
Feb
28
awarded  Popular Question
Nov
15
comment How long does it take for a metal to reach equilibrium?
@CarlWitthoft what about conduction?
Nov
15
comment How long does it take for a metal to reach equilibrium?
@JohnRennie when the inner eletric field is zero.
Nov
15
comment How long does it take for a metal to reach equilibrium?
Could you just give me some examples? I haven't enough physical and mathematical skills, I just want a rough approximation :)