inquisitive

what you say is not untrue. I have popped the post here as: science = data points... more the better chemistry = understanding of CO & NO2... any ideas of how to test for. results so far with very limited CO is many "zeros" and one "30ppm"..... but the one reading (bad science) could be an error.... and also I think the CO detector just jumps across its 30, 50, 100, 300 vaues.... which could mean I have zero or 29ppm in the car... and the data would just read zero. Anyone, any chemistry knowhow to get a test of sorts (quick n cheap would suffice) for CO or NO2 cheers

Thanks for thought John. The car has been checked for leeks.... all sealed. I need a methos of measuring to be in the car, so monitors over time.... small amounts long term (chronic) issues. * last winter i got effected... over time.... by syptoms resembling fuming... but it soon went away or became less significant. occasional irritant. * this winter (as is starting).... the same sypmtons are back The main observation I made was that I near always drive with windows open..... but at and around the winters they are more closed. So now I am "on it".... trying to identify and measure whatever I can inside the car. It has a wierd (i think) exhaust design..... it finishes anout 30 - 40 cm short of the end of the car (vauxhal estate).... I have been told this is normal design... but I wonder it may be the cause for eccessive fumes to waft under and then in the vents. So before I dump the car.... I'd like to take measurments inside.... as many as possible and for the main signatures of diesel exhaust fumes So as mentioned (gained knowl.edge)... is for CO and NO2 ..... just stuck on NO2 now anyone figure a quick little experiment to carry around in the cockpit for a few hours at a time? cheers

Hello I would like ideas... or contacts with very low cost products... that will give me a measure or indication to the possibility, of the presence (or not).... of diesel fumes within my car. I would like to measure one or more of the main diesel chemical components found within fumes CO, NO2, NOx So far..... I have bought a CO detector from DIY store..... it seems to be basic, in having 30, 50, 100, 300 ppm.... and that is it. Results so far = 0 most of the time and 30 occasionally. There is an USA company that offers beermat size "pads" for NO2..... these tyrn yellow if NO2 present.... any UK equivelent... or other low cost method / ideas Thanks for your time

hello have found this interesting question (interesting to me).... along with an equation that is supposed to allow the answer..... but I plug in the data and never get the same result as is correct. could someone set it out with the data so it flows to give -690N (if correct).... thanks (not an exam question or anything.... I found it and would like it as a model to find average brake force.... cheers) A 1100-kg car traveling at 27 m/s starts to decelerate and comes to a complete stop in 578.0 m. What is the average braking force acting on the car? answer: (a) -690 N (b) -340 N © -410 N (d) -550 N the answer is said to be (a) -690N and the suggested equations are these: Use Newton's second law in the form: F = ma And this equation of motion: v2 = u2 + 2as Where: m = mass F = braking force v = final velocity u = initial velocity s = displacement You end up with an equation like this: F = (mv2)/2s and the answer is -690 N ................................ appreciate thoughts, thanks ........ Have accomplished it.... (slightly obvious really) didn't bother with the end equation...... simply used first 2 equations in own right: * started with v2=u2+2as * then plugged that into F=ma * this gave answer in Newtons All done

very helpful thanks...... having the brakes assumed as giving same force, makes for simple relation of mass and acceleration.... therefore can figure that stopping distances vary also. ...... I can move on to study brakes mechanisms themselves in a little more detail now.... such as affects of ABS - i know it switches brakes on/off according to traction on road surface (anti skid).... but perhaps it is also governed by max force loading (and release) or max heat tolerence (and release) type of thing. thanks for equations and time to answer Interesting that heavy car could come to rest in same distance as force on road is greater.... understand principle of this.... and presume that the work done by the braking system must be greater to accomplish this...... If there were a max limit that a braking system were allowed to work at..... then (brakes working at that limit), I guess an extra massed car would travel further to stop..... but I would think that is where the study of braking systems would be interesting. Anyway, thanks for info I think I could go onto study car brake systems to see if such things as ABS, work at optimising max load (and release) and or max heat (and release)..... as well as max traction (and release if lock). cheers for now NOTE TO SELF: experiment to do..... 1. jump into a small car..... travel west at 30 mph..... EMERGENCY STOP.... [stamp fully on ABS brakes].... measure distance (load up same car with four extra persons, dog, camping gear, food including 10 bags of spuds to drop off at grandads allotment) 2. Do same as 1. now fully loaded.... measure distance. distance in 1. = x meters distance in 2. = same or less or more any bets regarding the outcome?

Hello . Have a question and am interested to find a simple equation to include mass as a variable regarding stopping distances of a car In the UK highway code..... a braking distance = 14m for a car at 30 mph (48 kph) my questions are..... if you load the car up fully (increase mass)..... then (for same v) that distance will increase???? Q1: by how much ? Q2: what's a simple equation ? NB 1. [The car and the road conditions are the same for each stop] 2. [the original car is say 1000kg] 3. [the fully loaded car is say 1500kg] thanks for time / thoughts inq

Thanks for reply John..... appreciate the half n half.... doesn't carry a reference to one being an opposite (direction) Perhaps this phrase?.... for the same closed system. Any momentum present (for vehicle and planet) will be exactly equal in quantity, but exactly opposite in direction

Hello. Could someone verify this notion about momentum.... thanks here is info: - The conserved closed system here, is a vehicle and the planet (via the road attached) - A stationary vehicle has no momentum - A moving vehicle has some momentum here is point to verify: A moving vehicle has created a quantity of momentum (forward direction for vehicle) AND it has created a quantity of momentum (opposite direction for planet) * So... the total quantity of momentum is exactly half each? As p=mv * So... the vehicle will have very small m and large v quantity * So... the planet will have large m and very small v quantity I wish to know if I can correctly state...... the total quantity of momentum is half each (for vehicle and planet) [this is linear momentum and no other factors effect the closed system] much appreciate thoughts, cheers

Most land massses are in the N.Hemisphere and here the major surface currents flow in a clockwise direction. This means that the currents flow down the west coasts of the land masses and are known as Eastern Boundary currents. The NE trade winds push the currents south and away from shore East to West. Combine this with something known as Ekman transport and this further pushed the waters East to West away from the shore. The upwelling occurs here because waters being pushed away from shore causes a gradient (sea slope) and water from below is pulled up to replace the surface waters pushed out to sea, so here you have your upwelling. Very briefly put, I know. Further reading can be had from the Open University book entitled Ocean Circulation (Its a banquet, if you are hungry for this type of info) Stephen

If you find a map of north and south magnetics poles plotted over time, you will notice that they move around the surface of the globe quite a lot. If you then compare the plate movements with this pole movement, you will see that what moves where (moving north, moving south) is relevent to where (which plate you are watching it from). when you are shown plate movement, it is always mapped from our present day perpective of our rotating globe and like most spinning things, the outer areas are effected more than anything that is at the 'top' or 'bottom' of the spinning object (forget north and south pole) The only thing left to notice is that there has never been a land mass at the 'top', if solid it is floating ice so wont move with plates anyway. The antarctic is a land mass and is (always has been?) at the 'bottom' of the spinning planet, so least effected....... and least moved. just a thought.... open to other thoughts/knowledge (errr or it could be the penquins anchored it)

Do all planets have magnetic fields? Is it a spin thing?

If you wanted it tested scientifically you need to know yourself how many times a year, a month, a day (average) this may occur as then they stand a chance of arranging a suitable study method. Also you would explain that you checked the obvious and so are not wasting there time. The obvious such as: Schools have energy saving lights that stay on (or switch on in rows) by infra red detectors picking up body heat... all the time people (live people!) are around the light rows stay on........... If your english room was empty, this would occur as you explained it. Lights in the home.... if tripped at the mains (for what ever reason)... no amount of flicking the light switch up or down will solve it.... maybe after you left (and the occupants were left without your temper), they could think to go to the trip switch... then the house light switches would operate as usual) If you do have a phenomenonmenomenon (spelling?) then it would be great to hear of it from a science reasoning....... Get them to feed back, thanks. (I dont think I've written anything offensive..... but I have a candle standing by just incase, he ha!) Good luck, it could be really interesting to discover an unknown reason.

Scientists are indeed today looking for a 'life force'. Something that exists in all living things and not in the deceased. Where science is studying and working with the art of Qi they consider that there is a 'force' that exists and that a part of it can travel actually from one living being to another (so it has a form). what form they do not know yet. .... it may indeed be in particle form. If so then tiny forms of life (bacteria, or even single celled) may be experimented on to see what leaves them when they become deceased (if thats the way to find it, although may be ways to find it without zapping the living critter).... I see what Zaphos was saying. It may just exist in higher forms of life in sufficient numbers to be identified and measured, this is unknown...... but quite a find in scientific discovery if such a thing is identified and measured.

#35 to #40 on size and speed of wave: In deep ocean the wavelength is several kilometers, but most is underwater and only about 1 meter is the surface height. The gradient is therefore very gentle and there is no breaking wave front . Because these wavelengths are massive they act as shallow water waves, so the speed is governed by the depth: c = sqroute of (gd) .....therefore in 4000m ocean they can reach around 700 km/hr next they hurtle over the continentel shelf (around 100 to 200m deep) c = sqroute of (gd) .....therefore in 200m they are slowed to max speed of 160 km/hr next they run into inshore waters and then the shore and so probably come ashore at around 15 to 30 km/hr As they are forced to slow, they build in height and steepness and form a breaking wave front. This breaking wave front hits the land and the surge of wave can take many seconds to poor itself ashore. A lot of variation in effect can happen depending of geography and contour of the ocean, continental shelf, inshore waters and the beach and inlying land. A little Tsunami 2D animation shows one form and finish at this site: http://www.seashoreantics.com/feature_000_tsunami.html WARNING can save lives! People (in most geographically shaped coastal residences) will only need to hop onto the equivilent of a first floor balcony made of substantial materials such as stone/concrete. Reality must be thought of as after the wave impact has settled, then water contamination, food stocks, energy, communication and shelter may still be massively adversly effected for the subsequent health of survivors.