Topic about masses (modern physics)

AI Thread Summary
The discussion revolves around a physics problem regarding the mass of a system composed of n freely moving particles. The initial claim suggests that the total mass of the system equals the sum of the individual masses of the particles. Participants clarify that the statement is incorrect, particularly when considering particles like photons, which have zero rest mass. A counterexample is requested to demonstrate the fallacy of the original claim. The conversation emphasizes the importance of understanding particle types in relation to mass in modern physics.
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Homework Statement


If a system is composed of n particles that are freely moving is M(system)=M(total masses of particles)(sum)


Homework Equations





The Attempt at a Solution



of course no , but these particles isn't photons or electrons my doctor didnt exacly told me what are they so how can i proove the answer is no PLEASE GIVE ME HINTS
 
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What is the rest of the question?
 
this is the question >>
 
If you think the answer is no, then you can pick whatever particle type you want and answer to show the statement is wrong. You just want a counterexample. Photons are a good choice.
 
Last edited:
thank you, you really helped me how to think about the problem...
 

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Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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