thegoofeedude Posted June 25, 2005 Report Share Posted June 25, 2005 I would never have guessed! :P Thank god I don't have to dodge flys in my car now. I knocked down twelve walls and killed 16 pedestrians today alone. Edit: It would be good though, if you could say arm police helicopters with flys in a big cage and when there is a car chase they release the flys and the rotors blow them down onto the road bringing the car to an imediate halt. This shit could save lives. We need more people like me on the force. ← Absolutely hilarious. Literally lol'ing. ;) :D :"> Quote Link to comment Share on other sites More sharing options...
Royaltrials Posted June 27, 2005 Report Share Posted June 27, 2005 What happens when you pull a yo-yo along a table by the string? Assume the table is horizontal and there is a constant tension in the string. Quote Link to comment Share on other sites More sharing options...
spunkey_monkey_boy Posted June 27, 2005 Report Share Posted June 27, 2005 Momentum (kgm/s) = mass (kg) x velocity (m/s) yeh? So if the train's going really slowly, say 10 m/s (same as a sprinter), and weighs what, 10 (metric) tonnes (= 10,000kg), so it's momentum = 10,000 * 10 = 1,000,000 kgm/s. And a fly weighs what 1g (=0.001kg)? Under the "conservation of momentum", ignoring air resistance etc, this means that if a fly which had a mass of 1g was going at 1,000,000,000 m/s (2,236,000,000 miles an hour), then it could stop a train which had a mass of 10 tonnes and was going at 10 m/s (22.36mph) Man I'm bored. (Y) ← :D Quote Link to comment Share on other sites More sharing options...
trials_pimp Posted June 27, 2005 Report Share Posted June 27, 2005 Boys, prepare to be amazed (Y) These are the answers you seek. They Fly can stop the train, as it can fly into Mr Burns Office, and sit on the power off button, and as Monty tries to kill it, he pushes the button, but as hes soooo weak, they fly will live, so no power = No train action. Q2 If its a good slinky, the metal kind, it will go forever. If its a cheap crappy Pound Wizard slinky, it wont do anything, as they suck, and dont work. Now, this is the real question: If a tree falls in a Forest, and no one is around, will it make a sound? Quote Link to comment Share on other sites More sharing options...
MrMonkey Posted June 27, 2005 Report Share Posted June 27, 2005 If a tree falls in a Forest, and no one is around, will it make a sound? ← Yes, it lands causing the air to vibrate creating a noise. I hate that saying as it's philosophical bull shit. Quote Link to comment Share on other sites More sharing options...
Davetrials Posted June 27, 2005 Report Share Posted June 27, 2005 Yes, it does, it cant not make a sound, if u put a recorder there it would make a noise, is that the same as no ones around? That makes no sence, im going bed. (Y) Quote Link to comment Share on other sites More sharing options...
trials_pimp Posted June 27, 2005 Report Share Posted June 27, 2005 yet, how can sound exist, if no one is around to hear it??????????? Quote Link to comment Share on other sites More sharing options...
cookie456_the2nd Posted June 27, 2005 Report Share Posted June 27, 2005 But the train can't stop, that would mean it would stop and start without anyone knowing. There for going from 0mph to 50 mph instantly, which is impossible. ← If the train went from 50 mph to 0mph, instantly, i think the passengers would meet the drivers carriage, instantly lol Quote Link to comment Share on other sites More sharing options...
Mark W Posted June 27, 2005 Report Share Posted June 27, 2005 The sound waves are still there. The only variable in the situation of a tree falling and there being someone there and a tree falling and no-one being there is the sound wave receptor (i.e. your ear). The absence of this doesn't change the impact creating sound waves. If a tree falls in the forest, and no-ones around, how would they know a tree had fallen over in the forest anyway? Quote Link to comment Share on other sites More sharing options...
trials_pimp Posted June 27, 2005 Report Share Posted June 27, 2005 Thats very true, they would find this out be returning to the scene of the crime, and finding a tree has hit the roof of their log cabin. Quote Link to comment Share on other sites More sharing options...
Smo™ Posted June 27, 2005 Report Share Posted June 27, 2005 That saying is such bullshit. Imagine the human race is blind; 'How the world exist, if nobody can see it?' Quote Link to comment Share on other sites More sharing options...
Tomm Posted June 28, 2005 Report Share Posted June 28, 2005 The sound waves are still there. The only variable in the situation of a tree falling and there being someone there and a tree falling and no-one being there is the sound wave receptor (i.e. your ear). The absence of this doesn't change the impact creating sound waves. ← Depends what you think sound is though. Random vibrations in the air aren't sound unless there is a person to hear them and convert them into sounds. Quote Link to comment Share on other sites More sharing options...
RyanRs Posted June 28, 2005 Report Share Posted June 28, 2005 (edited) well mike... i didn't see it like that :- I used the formula: (conservation of momentum) m1u1 + m2u2= m1v1 + m2v2 lets say m1 is the train (10,000kg) and m2 is the fly (0.001kg) as you said..the train is moving at 10m/s using the COM: 10,000(10) + 0.001(u2) = 10,000(v1) + 0.001(v2) you see...we don't know how fast the fly will "bounce" off the train yet...but, we'll say that the train stops...therefore: 100,000+ 0.001u2= 0.001v2 To work out how fast the fly will bounce at...i'll use newton's coefficient of restitution: e= speed of separation/ speed of approach now lets assume e is between o and 1 (reasonable (Y) ).... therefore e= v2/10-u2 so v2= 10e - eu2 We know that 100,000 + 0.001u2= 0.001v2 so 100,000 + 0.001u2= 0.001(10e- eu2) 100,000 + 0.001u2= 0.01e - 0.001eu2 lets say e=1 (now) therefore 0.001u2= 0.01-0.001u2 - 100,000 u2= -49999995 m/s If e=0 u2= -100000000 m/s don't worry that they are -ve (they are moving in the opposite dir. to the train...) if v2= 10e - eu2 v2= 50000005 = 5.0 x 10^7m/s I don't know who is right..i'v done some assuming....and typing it out gets really confusing >_< my speed is possible....with a big gun >_< anyways...anyone else doing mechanics 2 tomorrow? adam ← Someone has probally already put this, but i couldnt be bothered to read all 4 pages to find out.. your mathmatical theorys , altho theoryadically(sp) correct, are infact wrong. If a fly was travelling that fast towards a train, it would either create the biggest Bug VS windscreen SPLAT in the history of fly's VS windscreen (maby leaving big crack, or smashing the window) OR if it is a musclly fly, it would go straight throught the train, like a bullet going through something. There is not enough surface area for the fly to make effect to the trains speed. Maby it might make a decrease in the trains speed by like 0.0001 MPH? but lots of things could do that. I do though recon THE FLY from the old horror movie could stop a train, if it was to squirt acid at either the driver, causing him to die and let go of the controls and allow the emergancy brakes to come on. Or by begin run over by the train, causing its acid blood to go over the brake lines, bursting them, causing the air pressure to drop and allowing the brakes to come on. -Here is another question... You see all these space ships (in moovies) doing light speed, now, what happens if they hit a few planets etc while doing hyperspeed/lightspeed/warpspeed? would the spaceship die, or would it pass straight through it due to the mental speed its traveling? Ry Edited June 28, 2005 by RyanRs Quote Link to comment Share on other sites More sharing options...
JT! Posted June 28, 2005 Report Share Posted June 28, 2005 The chances of a world EXACTLY the same as this one (providing space is infinite) are 100% / certain. Good eh! >_<" Quote Link to comment Share on other sites More sharing options...
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