I nees help! Im doing a scince project on which bearings go faster and I need some examples.?
819580
Wheels\nMotors\nCrank shafts\nRear ends\nBicycle pedals
426452
The bullet is spinning at 306,000 RPM. (Revolutions Per Minute) And yes, that's really fast.  :) The example you cite would be toward the outside limit of "normal" rifle cartridges for bullet rotation but it's certainly possible. Most rifles chambered for high velocity cartridges have somewhat slower twist rates.
788884
well there's no such thing as a pro skateboard...but what do you mean by what kind of bearings...brand or abec?  if you're talking about abec then most pro street skaters use abec-5 bearings, while vert skaters like a bit more speed. so theyll use abec-7.  abec-3,5, and 7 are the most common.  the higher the number the faster and longer the bearing will make the wheel spin, but they need cleaned often and dont last as long.  as for the brand, they will skate bearings from whichever company gives them sponsorship.\n\nmost pros do not skate element bearings, they skate whoever they're sponsored by.
779555
Hey! I just finished learning about active transport! The teacher confused me soooo bad! I had to have a friend in my class explain it to me. I would suggest going to google and typing in "active transport" and clicking on the news tab on the top. good luck with your project!
985388
Ive seen them used before too but the efficiency and force they produce falls way short of compressed air.  Making an air canon would be your best bet and its probably safer.  It would definitely be easier to construct.
376431
yes, check out the bugatti veyron (world's fastest car- does 0-60 in 2.5 seconds) and the dodge tomahawk (bike that has a dodge viper engine). I don't know if they can go that fast, but pretty close for land vehicles.
698007
ok the best trucks i have ever used are phantom 2, and grind king. they last long and seem to ollie really good. Grind King [obviously] is good for grinding....\nI've heard that krux are good too, but i wouldnt know personally\n\nBY FAR, the best bearings ever are Zero Black Widow Bearings, and they seem to fit good with the best deck ever, Zero....
1055404
look up the question on here "why do bicycles gain stability as the speed increases?" then do a report on that, its original fun and fantastically interresting
202444
Go to the mfg site and look it up.\n\nWhat are the companies that made them?  You need to give more details and people can give more help!\n\nGo ahead right now and add additional details to this question!\n\nGO ON !!!!\n\nAPS
71350
Probably inboard/outboard, referring to the type of motor.
611797
This will definitely improve your performance.  A light shower of water should clean out the dirt/sand (don't spray a super fast hose stream of water at the components or you could blast the grease out of the bearings).\n\nAfter washing it with a gentle stream of water, you should dry it, and then apply some wet lube (I use finish line personally) to the entire drive train.\n\nGood luck.
804036
stationary : stator\nrotating: rotor
1053010
On a bisic model there are some basic questions:\n\n1: What is the velosity the item is to achieve to produce the results your are after. \n\n2: What mass are you allowed in you deisgn, as shaft design will need to be considered. \n\n3. What materials can withstand the velosity, and yet maintain you mass variable. \n\n4. Diameter is dependent on velocity, material,\n\nas far as buliding it... you must consider the G factor...dependent upon weather it is earth bound or space bound.
7127
here's a site with pics that might give you some ideas:\n\n\nhttp://www.physics.usyd.edu.au/competition/comp1998/comp98.html
938764
you need harder wheels and a higher ABEC bearing for them.:)
707285
512 miles/hr bearing 225..
435379
different bullets have different velocities.  What kind of bullet do you want to know about?