Determining Motion in Windowless Train: Is It Moving or Stationary?

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In a windowless train, determining whether it is moving or stationary is impossible without external reference points. Motion is relative and can only be assessed in relation to another object. Without any external cues, there is no distinction between being at rest and moving at a constant velocity. The discussion emphasizes that acceleration is the only way to feel movement. Ultimately, without external detection, one cannot ascertain their state of motion.
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Say you are riding in a windowless train that is either stationary or moving at a constant velocity with respect to earth. How can u determine whether you are moving or not? I cannot think of a way since u would feel anything unless the train accelerates right? Thanks to whoever reply :rolleyes:
 
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That's the whole point. You can't and there is no way you ever will without detecting part of what's going on outside. Motion can only be stated with reference to some other object. If there is no "other object" then there is no difference between being at rest, and moving with constant velocity.
 
that makes sense. thanks a lot chi!
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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