Quispiam

134 reputation

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visits	member for	10 months
	seen	Jan 21 at 21:07
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	134 reputation	bio	website		visits	member for	10 months
4 badges		location			seen	Jan 21 at 21:07

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Jan 17	accepted	Why is the spring constant $W_p''(0)$?
Jan 16	asked	Why is the spring constant $W_p''(0)$?
Sep 15	accepted	Force to use in harmonic oscillation through the inside of a planet
Sep 15	comment	Force to use in harmonic oscillation through the inside of a planet @ChrisWhite I know. I want to understand the concepts. If I was happy with the solution I would have written down what Emilio wrote and been happy with it. I'm not happy until I understand what is happening. The mathematical solution is just a step closer to understanding the concept.
Sep 15	comment	Force to use in harmonic oscillation through the inside of a planet I understand mathematically how you get $M_r = \frac{r^3}{R^3}M_0$, but I can't grasp why this is done. Why is the density of the sphere multiplied by the volume of the planet, and not the volume of the sphere itself?
Sep 15	awarded	Commentator
Sep 15	comment	Force to use in harmonic oscillation through the inside of a planet The first one really was a duplicate. Finding that original question helped me start to visualise the solution I later needed help finishing (in this question). Thank you though.
Sep 15	comment	Force to use in harmonic oscillation through the inside of a planet Wow, this solution gives me exactly the right answer. Thank you. I'm still not sure I grasp what exactly the solution does, but I'm getting there. It's just about mentally visualising it now... :)
Sep 14	asked	Force to use in harmonic oscillation through the inside of a planet
Sep 14	asked	Capsule traveling through a planet, find time for return
Jul 21	awarded	Scholar
Jul 21	accepted	How to calculate speed difference between objects close to the speed of light?
Jul 21	accepted	How to calculate time dilation in approaching speed of light
Jul 2	awarded	Supporter
Jul 2	comment	How to calculate time dilation in approaching speed of light Thanks to usumdelphini for editing my question - I'm still new to SE and didn't know I could use LaTeX. :)
Jul 1	awarded	Student
Jul 1	comment	How to calculate time dilation in approaching speed of light After an hour of working I realised I did everything right from the beginning, but the online test was unclear as to how the write the answer (ie I wrote 48432 years when I should have written 48000)... I calculated it with t = d/v = 100 000 / 0.9 ; t_0 = t * sqrt(1 - (v^2/c^2)) = t * sqrt(1 - ((0.9c)^2/(c^2)) Thanks a bunch for the help, dmckee!
Jul 1	comment	How to calculate time dilation in approaching speed of light I calculated t_0 to 111 109 years (sounds plausible, traveling 0.9c 100 000 ly). I calculated t = t_0/(sqrt(1 - (0.9c)^2/c^2) but wound up with 254 901 years, which seems really wrong. Shouldn't t < t_0?
Jul 1	comment	How to calculate time dilation in approaching speed of light Ah, I see. So I would calculate how long it would take to travel for example 100 000 ly in 0.9c m/s, ignoring relativity, and use it as t_0 (i.e. what it looks like to the "twin" left on Earth)?
Jul 1	comment	How to calculate time dilation in approaching speed of light @Argus Yes, I meant the pilot would experience the traveling going much quicker when he gets back.