How much rope would you need to build a raft?
541250
That depends on a few different things.  6 feet is definitely not enough.  If you're lashing together logs as I assume you will, then you'll need enough to lash each log to the one beside it, twice.  If you put 8 logs together, that will be 14 lashes.  If the logs have an average circumference of 12 inches and each log is wrapped 5 times and then the middle wraps, i'd figure about 10 feet per lash so if that's 140 ft. about 150-160 feet would be a safe bet because you'll end up needed to tie a few clove hitches.
142000
ok first off i'd like to point out that the navy uses 3 things that fit into the general category you are talking about\nrope (line)\nSteel cable (wire rope)\nChain (chain)\n\nit depends on what you are using each for.  i'm assuming now that you mean to tie off to the pier?  if not then please note it in the add details section.\n\nok the navy uses lines and sometimes wire rope to tie off to the pier however it is almost exclusively lines.  now if you are asking if one is stronger than the other than it depends on the size and material you are  talking about.  generally here's the breakdown and i'm not going to type in all of the increments cuz i really don't feel like it.\n\nusuallly the navy uses nylon lines as opposed to polypropylene and manila (marline) now a days though they are now trying to switch to kevlar (i'll get to that later)\n\nthese are the break pounds ratings for line vs wire rope\n\n       nylon......wire rope\n1/2"   6400.......18700\n1"     25000......72800\n1 1/2" 53000......160000\n2"     92000......278000\n2 1/2" 140000.....424000\n\nacross the board the wire rope is stronger yes but now look at it this way.  the navy uses 2 1/2" lines to tie off ships to the pier at 140000 lbs the wire rope equivalent would be 1 1/2".  now per 100 feet the line weighs 149 lbs\nthe wire rope weighs 360 lbs  its a matter of being able to handle the lines a 360 lb line is just to bulky and heavy also the mooring operation is very complex and wire rope kinks and twists in ways that tend to make it not easy to handle.  thats just for beginners now you have getting underway.  if pearl harbor happened again you think you're going to want to mess with 360 lbs of wire rope in a big tanged mess in order to get underway.  NO  you cut the lines loose.  then you have the issue of lines doing what is known as PARTING.  this is where the line (line here meaning MOORING LINE be it line or rope) breaks.  with nylon line you can install what is known as a tattle tale.  it is a smaller piece of line that is spliced into the line as the line stretches (and it WILL) if it is going to part.  the tattletail's will pop first giving warning to relax the line quickly or get the hell out the way.  when a nylon line parts it whips back like a rubberband at faster than the speed of sound it WILL KILL PEOPLE if they are in the WRONG place at the WRONG TIME.  now a rope whan it parts.  first you won't know it's coming cus there is very little stretch to a rope so no tattletail. second if you tried to put in a tattletail it would weaken the rope. now here's the kicker when a rope parts.  it not only snaps back but it also becomes in escence a shrapnel grenade.  there is no right or wrong place to be when a rope parts. IT WILL GET YOU.  and if it doesn't kill you.  you AIN'T GONNA BE HAPPY! remember i mensioned KEVLAR Lines?\n\nthe navy is switching to them cuz A: they weigh about the same as the Nylon does B: they are stronger C: you can put a tattletail in them without weakening them and D: when they part they simply drop down into the water. they don't snap back and kill people.  this is of course just the basics i'm not mensioning the myriad other reasons like chemical exposure rust etc etc...
503195
what size are we talking here? small use some of that packing material and use a exacto (sp) knife to form, shape sides roof , put it together with something that won't melt the Styrofoam
466097
By filling the pit up with as much rope as you need, and walking on the rope!
313678
Very easy. Get some recycled cardboard and duct tape and shape it into a boat.
13224
Live at least 100 feet above sea level.  Live in a well constructed brick house.  Make sure rafters are secured withy hurricane tie down strapes.
444593
if you had 3 pieces of rope 1 meter long you would have a total of 3 meters... if your rope to start with is only 2.7 meters long... it is only logical to conclude that each piece when cut equally would be LESS THAN 1 meter... that is the < symbol.
382563
A 15 foot dive would be safe, people do that all the time off a 5 metre high dive platform. What isn't safe is floating the 15 foot ladder on a raft with a platform bolted on the top for a kid to climb. You'd need a wide raft to balance out the weight of the platform combined with the weigh of the kid standing on the edge of the platform to jump. The weigh combined would unbalance everything tilting the kid and platform dangerously forward and when the kid jumped the raft, ladder and platform would rock dangerously and could tip over.\n\nTo do that safely you'd need something more stable to attach it to and deep enough water underneath to safely jump into. Around 10 to 15 foot depth. Unless you have a solid dock you could bolt a diving platform to I'd say you couldn't do this safely.\n\nYou could bolt a standard pool spring board to a floating raft if you wanted something they could dive from into the water. At least that would be a lot safer and less risk of killing a kid.
449999
Orange and red with at least 2 hooks in a trailer pattern! Be sure to use at least a 6 pount test unless the big boys are around. Then move up your test lines accordingly!
318413
OOO, We did this project in IPC, except our was 20 meters -.-;;. You're ideal angle is 45 degrees. That usually gets you the farthest. It would be pretty smart to use elastic potential energy by using piece of bamboo or just a flexible stick (haha, flexible stick) or just a rubber band. Don't put anything on the egg. Our model was made with a giant rubber band that I found on the floor, and a little seat attached to the crossbow model. If your teacher is strict about a catapult model, your best bet would be to use the bamboo stick and research trebuchets.
38713
well whatever force that is being exerted on the rope, that is going to be the tension. that means that all you have to do is calculate the force.  you just have to realize that not only is the gymnist accelerating, producing force, she is also overcoming the force of gravity. therefore, if you were to draw your free body diagram, you would have 2 forces pointing down, the force of gravity(mass times gravity), and this acceleration force(which would just be mass times the acceleration.  if you add these two forces together, you get the total force being exerted on the rope which is equal to the tension. here is the equation:\n\nT=F + Fg  (where T is tension, F is the force caused by the acceleration, and Fg is the force due to grabity.)\nT= ma + mg\nT= (74)(.11) + (74)(9.8)\nT= 733.3N.\n\nthis can also be done by just adding the acceleration to the acceleration due to gravity then multiplying this new acceleration by the gymnist's mass. either way you will get T=733.3N
500012
make a catapult or a trebuchet\nmake a lever\nmake a hydraulic lift ( soda bottle hosing balloon housing for balloon like a box or can, something to lift}
58756
It depends on a few things.  How long do you want the strand to create your arch?  How many balloons will you use in each cluster to create your strand?  The typical clusters are made of either three or four balloons.  It also depends on the size of balloon you use.  Most arches are made with 11" balloons.  \n12 x 3' \n\nI prefer to use 11" balloons in clusters of 3.  The typical length of the strands I do is about 24'.  I can usually plan on about 12 balloons for every 3' of the strand.  So a 24' strand takes around 96 balloons.  I would round that up to about 120 to account for poppage and damaged balloons.  \n\nIf you're looking to have one done I would rcommend you call a party supply store that sells balloons.  If they don't do it, they will have the best recommendations and references for you.  I've also included a site below that sells the instructions on how to make one.  Good luck and have a happy balloon day!
158404
as big as possible.You want if pretty big to keep the water as smooth as possible
760592
Basic Description:  \nIt's easy to make this simple hammock with durable fabric and some basic sewing. It is a lightweight, stable and comfortable accompaniment to any time spent in the outdoors. We will also show you a wonderful knot that will allow you to quickly tie up your hammock without causing damage to the trees or posts that you use as supports. You can also include mosquito netting to protect against insects. There is something so pure about swinging in a hammock out in nature: read on for all the details.\n\nMaterials: \nFabric, thread, rope.\n\nTools: \nSewing machine (or sewing needle), scissors, measuring tape. \n\nCost: \nThe plan itself is free! Estimated cost of materials: $18\n\nTime: \n2 hours\n\nDifficulty:\nEasy\n\n A complete material list is provided below at the link:
760545
If a weight is hanging from a V formed by two ropes, the angle of the V cannot be 180 deg, unless the weight is 0.\n\nThis is because the Tensions in the two ropes must compose to a force equal and opposite to the weight, which is acting vertically down.\n\nIf the angle is 0, then each tension is half the weight = 500/2 = 250 N\n\nFor any other angle, we need to know the relative lengths of the ropes.  If they are equal, the tensions are equal and\n2Tcos(a/2) = weight.\nwhere a is the "V" angle.
1146164
lots of concrete blocks, if u want easy portability. if u want it to be somewhat permanant, u can use concrete anchor screws, id recommend at least a foot long. more details, contact ur contractor