A.  Brake fluid should never be reused after it has been bled from the system. \nB.  Moisture in the fluid can decrease the boiling point. \nC.  It must meet the minimum standards that are set by SAE. \nD.  All of the above.
119341
D. Those are all true.
272352
Yes it should be taken out of service ASAP and checked for internal faults.\nHave you had the gas analyzed to confirm that it is Bucholz gas? In some cases large TXMRS such as a 100MVA has air pockets and can take many months for these to be freed.
441984
The friction is Ff = Uk*m*g = 0.71*m*g.\n\nThe car had original kinetic energy KEo of (1/2)*m*v^2. At 25 km/h, the car had KE25 of (1/2)*m*(25 km/h)^2. Convert to m/s before squaring. Find an expression for delta kinetic energy that the brakes scrubbed off before impact.\n\nThe friction had to do work equal to the delta kinetic energy to bring the car down to 25 km/h. Work is force*distance so\nW = Ff*d = 0.71*m*g*47 m\nand work is also is equal to delta KE\nSet them equal and solve for v.
411792
there are too many unknowns like air resistance, and the coefficient of friction between the brake pads. the friction in the axels.. this is a poorly asked question. you can probably just do k=.5mv^2 to get the total amount of energy in Joules and then convert to cal..
266935
As far as the grease, trust me, WD-40 takes it right off. My husband is a trucker and gets 5th wheel grease all over, WD40 takes it off. As far as the gum, the other person had a good idea with freezing it off with ice.
33984
Several, actually. First, surface tension of the soap holds it together. With equal pressure inside, all surface points are equally stressed outward. And the sphere is the smallest surface area available to a certain volume. Same applies to raindrops.
642744
Here goes nuttin'.... Trust me on this, I used to design and produce asphalt. Air voids in the asphalt are the most likely cause. Asphalt is designed with a certain percentage of air voids to help it shed water and to allow for expansion and contraction of the asphalt due to temperature changes. As the water seeps into these voids, air escapes. totalabyss, I agree with you. As far as oil being used while everyone else can't spill oil all over. Asphalt Cement, and automotive oils differ in many, many ways. You cannot pour asphalt out of a container at ambient temps. If it were a liquid @ 90 degrees, what would the road you drive on look like? The oil you spill all over actually hurts the roads us taxpayers pay for, plus it gets into the water system. If you ever come across an old chunk of asphalt, try this. Pour some hydraulic fluid or diesel on it, it will turn to mush. So, if this were to happen, say on one sq. ft. of road on every block in your neighborhood, the city would have to cut out the area, and replace it before it eats into the ground. So now this $3 used oil on our road is now costing us taxpayers $1800 to repair.
24087
1. They rev the engine first, usually to an engine speed close to the torque peak. In at automatic, the gear will be in gear with the brake down, and in a manual, the car will be in neutral because the clutch is down in first. Sometimes a few runs are required to find the best engine speed for launching. Each subsequent shift is performed at an engine speed so that the next gear will be solidly in the power band, usually at or near the torque peak again.\n\nIn an automatic: the brake is depressed, and to launch they simultaneously "sidestep" the brake, and floor the accelerator.\n\nIn a manual: they drop the clutch 90% and ride the remaining 10% for a second or two in order to minimize wheelspin and transmission shock, so that as much power as possible is transferred into forward motion.\n\nSide note: all of these techniques wear the car's clutch or transmission. Another test, with far less wear, is the street start 5-60, which is a near idle engine speed launch. Sometimes Motortrend, etc. does this test with expensive cars where the manufacturer doesn't agree to let them have a full launch. \n\n2. The only rule would be using a flat runway, and making no modifications to the vehicle.\n\n3. It is the best measured run. It will typically take a number of runs to find the best launch point and shift points.\n\nI've never heard of SAE involvement. Basically its assumed the publication is honest in its measurement tool. That being said, there are a lot of variables that could use standardization: temperature, humidity, road surface, driver skill, gasoline, and even the specifically produced car unit. For this reason, slightly different results from different publications are not unusual.
455443
The previous answer is partially correct.\n\nWater reacts with the excess acetic anhydride which is converted to acetic acid.\n\nSince the product is only slightly soluble in water, this also makes it possible to collect the product as a solid.
607892
Being a flight instructor i hear this question alot.  The best way to explain it is that its just like what comes out of your car on those cold winter days.  Way up at altitude it is extremley cold and the engine exhaust is very very hot and contains moisture which simply condenses in the cold air.  SOmetimes these contrails will actually become a cloud and hang around for hours and hours.  Its relatively harmless more so than auto exhaust but yes technically it is slightly "chemical".
533945
I wonder what's the end use requirement.\n\nIf there is any available in a lab sample size, then it should be available from one of the Laboratory & equipment supplies companies.\n\nIs this to be used raw or in some kind of cast and glazed form?\nI have heard many people are allergic to traces or sulphites even in a few ppm range ( that could be inhaled or ingested , so be careful ).
553114
H2SO4 will dehydrate and remove water.\n\n\n(CH3)2 CH - CH2-CH=CH-(CH3)2
339105
wow man that sounds a little crazy, like rocket science. i have standard 6in rotors and they rock and have never even in extreme conditions given out on me or had brake loss due to heat. i know your setup, id consider just doing one rear hyd. brake for weight/racing purposes, maybe even not use front brakes at all or just use v brakes for front.
98222
In automitive engineering it is often hard to define "better" especially in a competitive litigeous world.  As you mention, your brake lights are meant to alert the driver behind you.  Without a considerable amount of education, I think it would be difficult to train other drivers to interpret what you are doing with your brakes.  When accidents are caused it may become the burdon of the person braking to prove they did not cause confusion in a law suit.  If everyone has the same brakes, there should be less (lawyer caused?) confusion.  For example, some drivers merely tap on their brakes to alert a tailgater to back off.  The brake light comes on with little or no real braking action.\n\nHowever, there is no reason that novel methods of making brake lights more practicable, efficient and reliable should not be adopted.  Modern cars now are required to have brake lights in the rear window as well as at the tail lights; because that places them more at eye level.  Progress is slow but sure.  There is in engineering what is called the "coke bottle" effect.  For many many years Coke used the same small green coke bottle, because it worked!  If you change something that "works" you may solve one proble but create three new problems.  That said Coke did move on to use clear glass Coke bottles and bottles in larger sizes and plastic too.  Each advance may have given them new production headaches while on the learning curve.  I'd encourage you to pursue your novel ideas; but always search for the adverse effects.  Good luck.
65887
I suspect you used Naphtha, a volatile liquid used for cleaning items and removing oil and grease. This is a relatively safe chemical with the exception of its high volatility and flammability. However, anything is possible and if you have doubt or issues, I suggest you see a medical professional.
368109
a) Sodium stearate, a soap, forms a scum on bath tubs and shower screens with either magnesium, calcium or iron(II), as these salts are insoluble. For example:\n\n2CH3(CH2)16COONa  +  Mg^2+  ---> (CH3(CH2)16COO)2Mg  + 2Na^+\n\nb) Adding dilute HCl acid to soap, produces a greasy solid, which has its uses in cosmetics:\n\nCH3(CH2)16COONa  +  HCl  --->  CH3(CH2)16COOH  +  NaCl\n\nI hope that helps. If you need more assistance, please email me or re post.
188379
give it a good cleaning, especially in the gas piston area and other parts associated with cycling.  use a good oil like Remoil, CLP or Triflow.  stay away from WD-40.  also, try a higher dram shell.  those cheap promo loads don't have alot of powder, and they burn dirty.