hammo1 Posted October 26, 2016 Share Posted October 26, 2016 My friend and i were bored in our maths class and we wanted to figure out the terminal velocity of a frozen stick of pee 1cm in diameter and 40cm in length if it were falling from a plane 11km in the air... we are aware of how ridiculous this is but we just wanted to know so we could work out if it could kill someone and the answers we came up with were it either fell at 2cm per second or roughly 100 times the speed of light. thanks Link to comment Share on other sites More sharing options...
Sriman Dutta Posted October 26, 2016 Share Posted October 26, 2016 How ? Link to comment Share on other sites More sharing options...
hammo1 Posted October 26, 2016 Author Share Posted October 26, 2016 We looked up a formula online but I'm pretty sure we messed it up. Link to comment Share on other sites More sharing options...
Mordred Posted October 26, 2016 Share Posted October 26, 2016 (edited) How ? We looked up a formula online but I'm pretty sure we messed it up. I'm positive showing what calculations you used would contribute to a better discussion. lol we can already invalidate the greater than c calcs. Edited October 26, 2016 by Mordred Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted October 26, 2016 Share Posted October 26, 2016 My friend and i were bored in our maths class and we wanted to figure out the terminal velocity of a frozen stick of pee 1cm in diameter and 40cm in length if it were falling from a plane 11km in the air... we are aware of how ridiculous this is but we just wanted to know so we could work out if it could kill someone and the answers we came up with were it either fell at 2cm per second or roughly 100 times the speed of light. thanks So...seems urine trouble finding the terminal velocity 2 Link to comment Share on other sites More sharing options...
hammo1 Posted October 26, 2016 Author Share Posted October 26, 2016 I'm positive showing what calculations you used would contribute to a better discussion. lol we can already invalidate the greater than c calcs. this is the formula we tried to use... V= sqr root of (2*m*g/p*A*C) p= density c=drag coefficient a= projected area g= gravity m= mass v= terminal velocity of anyone could maybe show a solution with step by step working maybe i can understand. Link to comment Share on other sites More sharing options...
Phi for All Posted October 26, 2016 Share Posted October 26, 2016 So...seems urine trouble finding the terminal velocity ...and for that you need a math whiz, obviously. I'm positive showing what calculations you used would contribute to a better discussion. lol we can already invalidate the greater than c calcs. Please describe the effects of hurling a peecicle at the Earth from a plane at a fraction of c, say one quarter. Link to comment Share on other sites More sharing options...
imatfaal Posted October 26, 2016 Share Posted October 26, 2016 Phi - About the same energy as Hiroshima atomic bomb - that high up in the atmosphere who knows what would happen Link to comment Share on other sites More sharing options...
Phi for All Posted October 26, 2016 Share Posted October 26, 2016 Phi - About the same energy as Hiroshima atomic bomb - that high up in the atmosphere who knows what would happen Plus, you get pee all over you.... Link to comment Share on other sites More sharing options...
Janus Posted October 26, 2016 Share Posted October 26, 2016 Plus, you get pee all over you.... Well at least we are talking about frozen urine rather than frozen stool, or we'd be concerned about the effect of an icy bm. 1 Link to comment Share on other sites More sharing options...
geordief Posted October 26, 2016 Share Posted October 26, 2016 Well at least we are talking about frozen urine rather than frozen stool, or we'd be concerned about the effect of an icy bm. bm? Link to comment Share on other sites More sharing options...
imatfaal Posted October 26, 2016 Share Posted October 26, 2016 bm? bowel movement Link to comment Share on other sites More sharing options...
Phi for All Posted October 26, 2016 Share Posted October 26, 2016 Well at least we are talking about frozen urine rather than frozen stool, or we'd be concerned about the effect of an icy bm. [/mic holding] Slow. Clap. Clap. Link to comment Share on other sites More sharing options...
imatfaal Posted October 26, 2016 Share Posted October 26, 2016 I am noticing an increased tendency of the membership to very clever, yet very groan-worthy, puns. I know our forum spam-trap is buggered beyond repair but has our pun-preventer gone kaput as well. Link to comment Share on other sites More sharing options...
Sensei Posted October 26, 2016 Share Posted October 26, 2016 (edited) My friend and i were bored in our maths class and we wanted to figure out the terminal velocity of a frozen stick of pee 1cm in diameter and 40cm in length if it were falling from a plane 11km in the air... I don't think so there will be any significant differences than with piece of ice, with mentioned by you dimensions. So why exactly analyzing pee, instead of simply, neutral to readers, ice chunk? we are aware of how ridiculous this is but we just wanted to know so we could work out if it could kill someone and the answers we came up with were it either fell at 2cm per second or roughly 100 times the speed of light. How did you get to such conclusion? Can you show math, step by step. If there is no air (f.e. atmosphere-less planet with vacuum around), there is nothing to stop acceleration of failing object. What equation is allowing to calculate it? Then it's what you know is maximum, without any air/gas influence. Result of your further equation, which includes influence of air/gas, must be smaller that above velocity. ps. Wouldn't be better to start with sphere with radius r, than cylinder? Sphere will have at least constant "bottom" area, contacting with air below it while failing. ps2. Did you convert units appropriately? Cylinder has dimensions in cm, while equation probably have it in meters. The same with density (typically it is in tables in g/cm3). Edited October 26, 2016 by Sensei Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted October 26, 2016 Share Posted October 26, 2016 Well at least we are talking about frozen urine rather than frozen stool, or we'd be concerned about the effect of an icy bm. Well I guess that saves Phi's math whiz from working it out with a pencil... Link to comment Share on other sites More sharing options...
geordief Posted October 26, 2016 Share Posted October 26, 2016 Well I guess that saves Phi's math whiz from working it out with a pencil... Another one got through,imatfaal Link to comment Share on other sites More sharing options...
studiot Posted October 26, 2016 Share Posted October 26, 2016 (edited) A pun a day Keeps the moderator away or keeps the moderator at bay Couldn't decide. Edited October 26, 2016 by studiot Link to comment Share on other sites More sharing options...
Phi for All Posted October 26, 2016 Share Posted October 26, 2016 I know our forum spam-trap is buggered beyond repair but has our pun-preventer gone kaput as well. Jest a strained filter from too many pithy OPs. Link to comment Share on other sites More sharing options...
geordief Posted October 26, 2016 Share Posted October 26, 2016 Jest a strained filter from too many pithy OPs. Get it fixed ,man (no pun included). Link to comment Share on other sites More sharing options...
NickBlueCity Posted October 26, 2016 Share Posted October 26, 2016 Well at least we are talking about frozen urine rather than frozen stool, or we'd be concerned about the effect of an icy bm. Our next project is the terminal velocity of a pooteroide Link to comment Share on other sites More sharing options...
Janus Posted October 27, 2016 Share Posted October 27, 2016 Our next project is the terminal velocity of a pooteroide Otherwise known as an assteroid.(with the production of a large one resulting in another type of "roid". 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now