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 Elite Fitness Bodybuilding, Anabolics, Diet, Life Extension, Wellness, Supplements, and Training Boards
 Chat & Conversation
 Physics for today, Warick
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| Author | Topic: Physics for today, Warick | ||
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Guru 
Posts: 3100 |
Show tht the gravitational force on a test particle inside a thin spherical shell is zero. (a)By finding the force directly Hehehe, go to town Warick     | ||
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Amateur Bodybuilder 
Posts: 172 |
This will take him a while to respond to.... ------------------ | ||
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Amateur Bodybuilder
Posts: 78 |
I don't know how to formally prove that, but the Force on a test particle is equal to the product of its charge and the Electric Field (F = qE). The electric field is zero anywhere inside of a conductor (which I'm assuming that thin spherical shell is), so if E always equals zero, then so must F always equal zero. Sorry for the wussy answer, but I never liked electricity & magnetism much. =( -Warik | ||
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Pro Bodybuilder 
Posts: 421 |
Wicket W. Warrick. | ||
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Guru
Posts: 3100 |
This deals with gravity specifically, no electrical charge involved. So, go from there using [bold]Fij[/bold]=Gmimj/r^2ij([bold]r[/bold]ij/rij), Sorry for the horrid equation, but there is no equation writer on here. Wait till I get my pc next week then I can hand write, scan and post. | ||
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Guru
Posts: 3100 |
come on there Warik, this is right up thy alley. | ||
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Moderator
Posts: 1165 |
that's a hard question chesty.. btw did you get mail? | ||
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Guru
Posts: 3100 |
Got it, just sent a reply, that is what me and someone else had figured, but weren't sure. | ||
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Amateur Bodybuilder
Posts: 78 |
Wait a minute, chesty, did you mean a test particle in the center of a thin spherical shell isolated from the rest of the universe? If so, then the gravitational force on the partical is obviously zero because if it is surrounded by a spherical shell, the force of gravity acting against it is equal from every single point surrounding it. The same applies for, say, a human being in the center of the Moon or something. The acceleration due to gravity would be zero. That, by the way, is probably the closest one can get to "zero gravity" because while floating around in a shuttle in space, one is still experiencing gravitational force from nearby celestial bodies and from the ship itself. Please don't tell me that you meant something else by your question. =) -Warik | ||
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Guru
Posts: 3100 |
Well, technically I did. I mean a test particle ANY WHERE in the sphere. Prove that it is zero. |
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posted October 06, 2000 04:20 PM