Relativity Problem: Find Speed & Momentum

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The discussion revolves around a relativity problem involving a moving particle with a rest mass that is double its kinetic energy, prompting inquiries about how to find its speed and momentum. Participants express curiosity and engage in light banter, with one member indicating they know the answer but prefer to let others respond first. Another member emphasizes the importance of maintaining a calm demeanor, highlighting the intriguing nature of physics discussions. The conversation reflects a mix of frustration and enthusiasm for solving complex physics problems. Ultimately, the focus remains on collaboratively finding a solution to the stated relativity question.
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hey i came across this question on the web..has to do with relativity...i was jus wondering if anyone knew how to go about doing it ..."a moving aprticle has a rest mass which is double its kinetic energy. fins its speed and momentum"...
 
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oh excellent question aptiva i of course know the answer but i will sit back and allow others a chance
 
aptiva what website may i ask did u find it on i wud like to go set its ass on fire
 
well hype_chicky...i think u should settle down..there is no need for stress...its remarkable to see how one little problem can ignite one to react in such a peculiar manner ... that's just what i love about physics...but back to the real problem...would anyone know how to go abouts solving this?
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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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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