May 9
stress transfer theory
you do not talk about stress transfer theory in plate tectonics
Pulse
Why is the heart a double beat whereas the pulse is a single beat? What is the most prominent pulse in your body and does anyone know what chamber initiates the pulse?
-I choose to remain anonymous
My pulse is often a double beat, especially if I measure it from my chest :) You usually only feel one beat as the other sends blood just to the lungs :) And I am quite sure it is the left ventricle that creates your pulse :) And you don't have to say you are anonymous, noone here knows who you are anyway, and signing will give just a munber, from which almost nothing can be found out about you :) HS7 11:59, 9 May 2007 (UTC)
motion in universe
Is it possible to stop moving? Say I take my spaceship and go to the least occupied part of the universe. Is it possible to just not move? If so, would I recognize that I've stopped moving?
It's a meaningless question. There is no such thing as absolute motion - you can only ever measure your speed with respect to something else. Einstein, relativity, all that stuff. If you aren't actually accelerating - you can consider yourself to be stationary at any time and in any place - it simply has no meaning to say that. SteveBaker 14:55, 9 May 2007 (UTC)
Questions about birthmarks
I have an area of abnormal pigmentation covering most of the back of my left hand. I have always described it as a birthmark. It's red and blotchy and much warmer than the surrounding skin; it looks a lot like the burst blood vessels you get with love bites. It is much lighter than a port wine stain. I read the Wikipedia article on birthmarks and mine doesn't seem to belong to any of the types of birthmarks listed. Are there other categories? Also, it appeared one day when I was six years old, but the doctor said it is still a birthmark, and they sometimes do appear that late. However, I can't find any information about this phenomenon online. I'm interested to know why a birthmark would suddenly appear, and how common it is. --Grace 06:11, 9 May 2007 (UTC)
What's the L in L-ascorbic acid?
If you buy plain ascorbic acid (vitamin C) in the store, is that the same thing as l-ascorbic acid? Sorry for being dumb - I can't find anything in the vitamin C article that addresses the meaning of the L. --Grace 06:29, 9 May 2007 (UTC)
Life on(to) Mars
What sort of precautions, if any, are taken to make sure that bacteria and other small organisms aren't carried to Mars on the probes and rovers and such that we send there? Dismas | (talk) 08:43, 9 May 2007 (UTC)
See also planetary protection. Icek 10:54, 13 May 2007 (UTC)Mobile phones
Can mobile phones damage your brain. I have one and use it quite alot.
Hot air balloon speed
Settling a dispute between a buddy of mine and I. In a hot air balloon, in say, 25 mph of wind, how fast would you be traveling? My understanding of it is, since any energy transfer (kinetic energy of the wind -> kinetic energy of the balloon) includes loss due to entropy, drag, all that, you'd never attain the same speed as the wind, while he contends that the balloon travels at the exact same speed as the wind (or effectively the exact same, the difference would be minimal). Thoughts? Especially with links to back it up? - M 10:52, 9 May 2007 (UTC)
if, however your talking about convayences in general, it is easy to go above the wind speed in a sailboat.--Hacky 20:41, 9 May 2007 (UTC)
Yes, but at an angle of about 100° to the wind, it can easy go faster see sailing "Some extreme design boats are capable of traveling faster than the true windspeed." --204.234.208.164 16:45, 10 May 2007 (UTC)
Converting alcohol to alkene
There was an exam question that asked for a way to convert an alcohol to an alkene without using dehydration or elimination. Does any body know any other methods with which such a conversion can take place?Bastard Soap 12:16, 9 May 2007 (UTC)
I have no idea of what you just said... so I guess you are at a much higher level than I am. What would happend if you passed a current through the alcohol? Bastard Soap 11:14, 11 May 2007 (UTC)
Own sweat smells nice.?
Okay weird question. As my understanding goes, we find other people's smells attractive because their genes are different to ours. The more genetically different they are, the better they smell. However, I tend to find my own smell attractive... or at least not offensive. Where by my logic I would assume that my own smell should be the least attractive to me, as I have the exact same genes to me, and so I should be attracted to someone who is the same as myself, as this offers no advantage from the point of view of genetic mixing. More worrying, does this mean that i will find someone with similar genes to me more attractive in this sense? Or, is it just the case that I am familiar with my own smell? Or is it that the gene-smell test only works in the case of early encounters - but you can get used to an offensive smell and find it comforting?? Will be glad to hear your thoughts.. Or even if we have an article on the topic. 213.48.15.234 13:18, 9 May 2007 (UTC)
I saw a program once where they got a group of men, halve very attractive and have very unattractive, to do vigorous excercise. They then wrapped dolls in the mens t shirts and got 4 female models to come and smell the dolls, choosing which ones they prefered the smell of. every model chose the smell from the unattractive men. So your theory sounds right to me. And of course from an evolutionary point of view things like perfume and hair spray have been around a lot shorter time than we have been smelling each other. Anya Fox89.241.20.220 14:11, 9 May 2007 (UTC)
yeast
how can you tell whether yeast cells are dead? Basically I need to conduct an experiment in which I will need to know whether any cells in a sample of yeast are still alive. I thougt just putting them underwater and waiting for the bubbles to stop, but I suppose they would produce ethanol then, and all get drunk and die. Are there any other reasonably easy and feasible ways to see if the cells are alive?
actually temperature is the variable I am measuring.
Really what I wanted was something that would show whether the yeast was alive or not. I have to cook them until they are all dead, and have no idea how to tell. I expect looking at them under a microscope will be too complicated and take too long.
How about using the yeast to make bread ? If it's alive, you have a nice loaf of bread. It it's dead, you have matzo bread. StuRat 22:18, 9 May 2007 (UTC)
Are therre any chemicals I can pour into the yeast that will make them look different if they are alive than if they are dead?
I've given up on this and gone for the easy option of using a respirometer.
Zip line speed
I need to make a zip line for a show I'm doing and I need to know A) pythagorus theorum so I can work out the height from the ground to the zip line, at any given point on the zip line, so that things can pass under it. and B) the equation to work out the speed that an 8 stone person will travel over a given distance and height. My two towers are roughly 7 metres and 5 metres tall across a 50 metre distance thank you Anya Fox89.241.20.220 14:05, 9 May 2007 (UTC)
You are neglecting both air resistance and friction. Air resistance would be pretty negligable at those speeds - but friction in a zipline isn't. Te effect of a slightly saggy cable ought to be beneficial since it'll make the cable steeper to start with (more accelleration - more speed to start with - hence more excitement) - and will then make it level out and perhaps even head uphill slightly at the end - which will help to decelerate the rider before the big "kersmack!" at the end. That being the case, if the zipline does seem to fast at the end, it may be worth slackening off the cable a bit to simultaneously make the ride more exciting - and slow it down where you need it to be slower. SteveBaker 19:20, 9 May 2007 (UTC)
The hang of cables without any additional weight follows that of a Catenary. As far as how a a cable hangs with something hanging from it, that sounds a little bit like one method to draw an Ellipse (see figure drawing on article). Root 4 (one) 20:04, 9 May 2007 (UTC)
I wonder how heavy the cable is? If it's nothing compared to the rider - then you're right - a section o
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