Michal
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 Apr 1 awarded Revival Mar 9 asked Fallacious derivation of the rocket equation Oct 24 awarded Yearling Oct 12 comment Distance between coils on a massive spring would the force pulling the bottom of the blue box also be changed to $k(f(x+h)-x-h)-\rho g (x+h)$? In the case $f(x)$ also seams to come out linear... I've also realised another mistake I made: the spring constant $k$ is dependant on the length on the spring Oct 12 revised Distance between coils on a massive spring fixed image Oct 12 comment Distance between coils on a massive spring Surly the mass above the blue box has no effect on the extension of the spring in the blue box. If we were to cut the spring at the top of the blue box and rigidly attach it somewhere, I have a hard time believing it would "know" about it and the extension on the part in the blue box would change. Is there a book that you might recommend to help me understand this more? Oct 12 revised Distance between coils on a massive spring changed title to be more descriptive Oct 12 asked Distance between coils on a massive spring Mar 27 comment Time for water wave to reflect Sorry if i phrased the question wrong. I meant to ask will the bounce be instantaneous? What factors (even small ones) might make it non-instantaneous? Mar 26 asked Time for water wave to reflect Mar 9 comment Is there a curve for which a particle restricted to move within it under the gravitational force will always exhibit a pure harmonic motion? Sorry - a cycloid not a catenary. Here is the relevant wikipedia page Mar 9 comment Is there a curve for which a particle restricted to move within it under the gravitational force will always exhibit a pure harmonic motion? If memory serves me right the catenary has this property. I'll will try to find a source or a derevation Mar 7 comment Distinguishing between solid spheres and hollow spheres (equal mass) I wouldn't call this the "best" method but it made me smile: if the hollow one is filled with gas you can cool them down and hear the condensed gad sloshing around Dec 26 revised How can ants carry items much heavier than themselves? added 1 character in body Dec 16 awarded Good Answer Dec 16 awarded Mortarboard Dec 16 awarded Nice Answer Dec 16 answered How can ants carry items much heavier than themselves? Nov 2 accepted Power dissipation in High Voltage Cables Nov 2 comment Power dissipation in High Voltage Cables But we can also express it $P=V^2/R$ also making it quadratic in voltage! In the end the current also depends on the voltage.