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 Jan 24 awarded Popular Question Jan 8 comment Why can we assume, when dealing with tension, that the mass of a rope is $0$ but still assume that there are forces on it? If you want to account for the mass (really weight) of the rope, then you would just integrate those equations over the length of the rope. Nov 29 comment Shape of an inverse cube orbit? Steven, thank you for the answer, but r'' is not the acceleration in this case. Nov 28 awarded Self-Learner Nov 28 comment General Solution to Linear Schrodinger equation Do you have mathematica? Nov 28 comment Shape of an inverse cube orbit? @Rol That's what I ended up doing... Nov 28 answered Shape of an inverse cube orbit? Nov 27 comment Shape of an inverse cube orbit? Wait, r'' is NOT the acceleration because we need the centripedal acceleration. r'' in this case really means nothing. Nov 27 comment why don't large magents repel themselves The second picture got the point across to me really well. Nov 27 asked Shape of an inverse cube orbit? Oct 28 comment Perception of Depths and Stereovision When you close one eye you still have some depth perception because you have a reference already for what depth should be. If you were placed in a completely new, funhouse type environment with only one eye, you would be pretty messed up. So yes, a one eyed monster would only have depth perception from previous experience, and it would be poor. Oct 28 comment Confusion about gravity After 100,000 years they would both start moving towards the center (assuming equal mass). Oct 28 awarded Organizer Oct 28 revised Confusion about gravity fixed a word Oct 28 suggested approved edit on Confusion about gravity Oct 8 comment Special Relativity and Gravity If you are simply asking if special relativity regards gravity? It does not. Sep 12 comment What causes electrical boxes to hum? Just an intuitive guess here, but the AC current generates a changing magnetic field. Maybe that causes the wires to vibrate in Earth's magnetic field. Aug 30 revised Why, fundamentally, are particles charged? just doing some nit-picking edits. changes "small" to "less massive" Aug 30 suggested approved edit on Why, fundamentally, are particles charged? Aug 30 comment What is voltage? Voltage is simply a difference in electric charge, caused by a number of things. In a battery voltage is caused by a chemical reaction. In a lightning storm, voltage is created by friction. Essentially any time there are more electrons in one place than another you will get a voltage.