Timeline for Basic question about law of gravitation [duplicate]
Current License: CC BY-SA 3.0
12 events
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| Apr 13, 2017 at 12:40 | history | edited | CommunityBot |
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| Jan 23, 2012 at 10:14 | comment | added | voix | Look at The Time That 2 Massess Will Collide Due To Gravity. The resulting formula is pretty nice, for $M>>m$, $\large \bf{T= \frac{\pi}{2} \frac{h}{v_e}}$, where $\large v_e$ - escape velocity, $\large v_e = \sqrt{\frac{2GM}{h}}$ | |
| Jan 23, 2012 at 9:13 | history | edited | CommunityBot |
insert duplicate link
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| Jan 23, 2012 at 9:13 | history | closed |
Qmechanic♦ David Z |
exact duplicate | |
| Jan 23, 2012 at 9:03 | answer | added | twistor59 | timeline score: 1 | |
| Jan 23, 2012 at 8:52 | answer | added | Maksim Zholudev | timeline score: 1 | |
| Jan 23, 2012 at 8:34 | comment | added | John Rennie | Have a look at physics.stackexchange.com/questions/19813/… as this describes a similar calculation. | |
| Jan 23, 2012 at 8:18 | comment | added | Green Noob | @Bernhard I just took 10 km as an example. What I really wanted to know was how to solve the problem considering the variation in distance. | |
| Jan 23, 2012 at 8:15 | comment | added | Green Noob | @LubošMotl Can you give a more detailed answer? I'm familiar with differential equations (though I don't claim to be an expert) I'll try to grasp whatever I can. | |
| Jan 23, 2012 at 8:14 | comment | added | Bernhard | @LubošMotl If you want to calculate the time at which they meet, an approximation with constant r will get you close enough. Since the radius of the earth plus 10km will not change too much here. | |
| Jan 23, 2012 at 8:00 | comment | added | Luboš Motl | The time needed for two balls to collide by the action of gravity: It's an analytically solvable problem but too mathematically contrived one for a beginner. The resulting formula is pretty messy. One has to find the solution to the Kepler problem (differential equations) etc. Yes, the acceleration is accelerated because the force (and therefore acceleration) itself is increasing as the particles get closer to each other. | |
| Jan 23, 2012 at 6:32 | history | asked | Green Noob | CC BY-SA 3.0 |