# Recent content by mnmman

1. ### Sunlight Intensity Concentrator - Idea to boost solar energy

OK i see what I did wrong in my math, your right 1300 W/m^2
2. ### Sunlight Intensity Concentrator - Idea to boost solar energy

Where's this figure from?
3. ### Sunlight Intensity Concentrator - Idea to boost solar energy

I never did say anything about a mirror, I don't know where that idea originated. I'm thinking more along the lines of capturing the energy of the expanding sphere of sunlight before it dissipates to much. If you imagine the wavefronts of my drawing in 3-D you see how the closer we get the more...
4. ### Sunlight Intensity Concentrator - Idea to boost solar energy

I'm not saying we have to harvest every last bit of power the sun gives off, just a 100 sq meter portion of it. As for frying cities, would there not be a way to have a satellite closer to earth, splitting the energy up to a few other satellites and so on until it is reasonable to shot the power...
5. ### Sunlight Intensity Concentrator - Idea to boost solar energy

So I had this idea and I want to run it by some people and see if it's 1) possible 2) worthy of pursuing further 3) a good idea. I don't have a degree in engineering or physics, I'm currently studying chemistry and am taking physics 2 (E&M) right now, so excuse me if I don't use the correct...
6. ### Where is the alcohol peak on 5-iodovanillin?

Well I posted on another forum and they said that it is probably to to rapid exchange of the phenolic proton on there. Makes sense because I used acetone and ketones have a lower pka value than phenols. So yes it is solved. Thanks tho
7. ### Kinetic friction and lost mechanical energy

Ok so there is no ratio. I think your getting force and energy confused also. Be aware that force has units of Newtons= kg*m/s^2 and energy has units of Joules= N*m= kg*m^2/s^2. The mechanical energy lost is equal to the thermal energy generated. So if T is thermal energy then using conservation...
8. ### Schools Local university doesn't offer physics major

Where is this university? I want to go to school for free! All I can say is I'm a sophomore in chemistry right now and I study physics probably 10 hours a weeks, chemistry another 10 hours a week plus other classes (about 3 hours for each hour in class). But I believe I'm more motivated that the...
9. ### Kinetic friction and lost mechanical energy

I agree with you that u= tan(theta). As for the ratio- the ratio of mechanical energy lost to what? Thermal energy maybe?
10. ### Where is the alcohol peak on 5-iodovanillin?

So I'm pretty sure I got 5-iodovanillin. The melting point in the literature is 183-185 C and I got 182.7-183.5 C. But my NMR spectrum isn't showing the alcohol peak. It barely shows up on the SDBS spectrum also (http://sdbs.db.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi). Does anybody know why...
11. ### Hybridization of carbanion in rings

ok I can see it now that was very helpful, so if you draw the resonance structures and they end up looking the same but rotated, is that a way you can tell they are especially stable? Does this theory have anything in common with VSEPR? My book only mentions VSEPR and nothing about valence...
12. ### Hybridization of carbanion in rings

So this question asked me to determine whether this compound was aromatic, antiaromatic, or nonaromatic and also asked how many pi electrons there were. I figure since there are four groups of electrons the carbanion is sp3 hybridized and I think I'm correct because that is what this thread...
13. ### Polarization of an Insulator

OK so what your saying is the electrons still do move, but only within the atom or molecule?
14. ### Polarization of an Insulator

So I just started Physics 2 Electricity and Magnetism and I'm already scared for my life. The professor first did a demonstration where he charged up a Teflon rod on some sort of cloth and moved an aluminium can with the rod. I understand how that happens. The can is a metal and conductor so the...
15. ### Dehydration / demoisturization

I've used perlite in the past to get food nice and crispy. But make sure you don't let the food come in contact with the perlite, might be dangerous, I'm not sure.