big314mp

I think I did this once. Entirely unintentionally, of course

You can't do an ion exchange column because the bromine won't dissociate off of the the rest of the organic molecule, the way it would in a salt. Therefore, you don't have any ions to exchange. YT (I think) is referring to something like LiAlH4, which will react as if it is H-. It will act as a strong nucleophile. Just for my own amusement, you can also eliminate to form the double bond, and then hydrogenate.

Before anyone jumps on you and tries to murder you, I'm going to make a point in the name of Hanlon's razor. The posters here are taking issue at your assertion that there is a way things are "supposed" to be. You are assuming that there is a specific way that people should have sex, when in reality that is a value judgment that we should allow individuals to make. There are lots of things people do that negatively impact their health, yet they engage in these activities all the same. Smoking for example. People can choose to smoke, knowing that it is bad for them. That is their decision, and it is based on their values. You really have no right to impose your values on someone else's life. If you want to debate/discuss the medicine, by all means proceed. But assertions like the above are going to get you torn apart here.

Temperature is relevant, as the moles of gas is dependent on pressure, which is dependent on temperature. The total pressure is also dependent on temperature. Maybe they cancel out somewhere and I'm missing something.

If you get the cars to drive close enough to one another, you can have them slipstream one another to increase fuel efficiency.

I think it's why you aren't supposed to spend very long in hot tubs - impaired cooling + improved heat transfer into the body.

Last I checked, my dentist wasn't furry Perhaps the sheer number of cancers out there is part of the issue. If the tech in iNow's article is actually put into practice, then lots of cancers could be easily screened for. Callie already pointed out that patients are tested for breast cancer already. I'll add skin, prostate, colon, and testicular to that list. So in a sense, we already implement this to an extent.

The other thing is that a dental check up also incorporates a dental cleaning, which can help prevent problems. Whereas a cancer check up is just diagnostic in nature. Basically, dental check ups actively prevent tooth decay, whereas cancer check ups don't prevent cancer.

Does the question give you a temperature? You should be able to use the ideal gas law.

It's not that bad here in Ohio. Honestly, the local blood bank is worse. And the title of this thread can mean something ENTIRELY else in a different context. Say, "pharmacology"

Your battery pack is also going to have to be very robust to support the heating load for that long. If you do go that route, get some proper resistive wire, like the type used in hair dryers and heat guns. It goes by the name of NiChrome wire. And make sure the tank is coated in a thin layer of insulating material, so you don't short the coil out. A more practical solution is compressed air, so you don't have to deal with the heat of vaporization issues CO2 has. Barring that, perhaps a hot water bottle may be more suitable?

Remember that total pressure is the sum of all of the partial pressures. So (stuff in () is subscript): P(H2) + P(N2) = P(T) What this means is that you can calculate the pressure of each gas as if the other wasn't there, and then add them together to get the total pressure. So the problem becomes: 1) You have 2.0L of gas A, and it is at 475 torr. You let it expand to 3.0L. What is the pressure? 2) You have 1.0L of gas B, and it is at .2atm. You let it expand to 3.0L. What is the pressure? 3) Add the answers from 1 and 2, and you will get total pressure.

AC voltage is measured in something known as RMS volts, which stands for Root Mean Square. AC current (I'll assume you're using wall current) is a sine wave, and the average value of the voltage is the voltage given. So 12V AC means that the average positive voltage is 12V. When you rectify AC to DC, your voltage changes from the average to the peak voltage. So instead of the average of the sine wave, you need the peak. To calculate this, you need to multiply the voltage by the square root of 2 (~1.41). So 12V AC will become 17V DC. To get the amps available, assume energy is conserved and use the watts in to calculate the amps out. Basically 12VACx2A = 17VDCx?A. So you get roughly 1.41A. You will need to use capacitors to smooth out the pulsed DC (the rectifier basically takes the absolute value of the voltage function), in order to get a decently constant voltage. This will also affect your peak amps, but not your average amps. Remember that this is ideal. In reality you need to compensate for: Diode voltage drop as Neon said. Supply voltage collapsing under load Misc supply losses (ex. resistive losses in a transformer).

Google "define: cure" (no quotes). The first def it pulls up is pretty funny, in an ironic sort of way. I think a cure "resolves" a disease. And I think a disease is as aspect of someone's health that interferes with their daily activities.

Well, on the highways here, there are sound barriers built along the sides of virtually all of the highways. At 300km/h, road noise and wind noise are going to be serious problems barring new technological developments. I have heard of a new type of asphalt that helps reduce road noise, so the problem isn't necessarily unsolvable.

There is no way you are 15. I refuse to believe that a 15 year old is more mature than I am

If you use GPS (and actually put some real effort into bug elimination) you can use that to guide where the vehicle goes. Use radar to measure how far the car in front is, to adjust following speed. If you bury two wires in the road, and build a car that can detect where those wires are, then you can have a car that stays in a lane. You can also do that without completely replacing all of the roads. You could probably do it when the roads are being resurfaced, and thereby save on tearing up the asphalt. You really only need to do this on major roads an highways, as backroads are probably better off under manual control. As for the fences, the most of the highways here have fences and/or sound barriers already. It's not a huge issue to install them. Which raises another issue, IMO. What about noise levels of traveling so fast?

Oops. It is supposed to be F. Anyways, I just did this problem the other day for my physics homework (it was the Space shuttle, and it was orbiting lower) and we were expected to use the orbital velocity given to calculate the force of gravity. I figure this is the same question, just with a bit of info missing.

I think kids running across highways is a virtual non-issue, that can be dealt with the same way highways keep kids off of roads: common sense and barriers. Now, what happens if/when a car breaks down on the road? You would have to have some way to rapidly clear a broken down vehicle off of the road. Or perhaps you could do something like what (I think) npts is advocating, except that both control and power come from the external track. Rails are the most viable option for that.

Lets say I receive a rep point. Is there anyway I can tell which user sent me that point, or is the system anonymous?

I'd feel uncomfortable with a GPS only system, considering that slight inaccuracies (18 inches, even) could kill people. And what happens if the signal is dropped? I'm thinking a road based system to guide the car, and GPS to tell it where to go.

Wouldn't electricity just be an arc furnace (basically). Sunlight would be a bit harder. Maybe a Fresnel lens on a bit of iron ore. Or (and I consider this cheating) using solar power to drive an electric arc furnace.

I would use the magnet-levitating-over-a-superconductor effect. There's a thread here somewhere, with a video of a guy doing exactly what you are imagining.

Usually you are given a velocity also with these problems. Otherwise, you could try g=GMm/r^2, although I don't think that will give you a good answer.