Jump to content

# EvoN1020v

Senior Members

532

1. ## Basic Elements?

No, it's not too hard to memorize all of them when you are used to them everyday in your chemistry classes.
2. ## Can someone help me how to do this

Use the formula $\triangle H_{vap} = n \cdot H_{vap}$ You have the total enthalpy change and the moles of the chemicals. You should be able to solve it.

Omit.
4. ## Having problems with math problem

Integral of $x^2 + y^2$ is $\frac{1}{3}x^3 + \frac{1}{3}y^2 + C$. Thought this might help.
5. ## Basic Elements?

Sometimes Lithium (Li) is used too.
6. ## Should I Attack my Wife?

Seemingly ku (the OP) hasn't posted to answer any of our questions and comments.
7. ## derivative (n) times!!!

The second derivative is: $\frac{e^{\frac{1}{x}}(-1+2x)}{x^4}$. Now, Math89, I hope you can detect a pattern in the derivatives?
8. ## derivative (n) times!!!

Check it yourself DH. I just edited my post. Therefore, the derivative rule that I used was not wrong.
9. ## derivative (n) times!!!

What I got at first was: $e^{ \frac{1}{x}} \cdot ln e \cdot \frac{-1}{x^2}$ according to the derivative rule: $a^u = a^u \cdot lna \cdot u'$. The answer produced was: $-\frac{e^{\frac{1}{x}}}{x^2}$, which apparently is the correct answer according to the integrator tool here at http://integrals.wolfram.com/index.jsp. In conclusion, the derivative of $e^{\frac{1}{x}}$ is $-\frac{e^{\frac{1}{x}}}{x^2}$. Sorry for all the confusion, Math89.
10. ## Yo-yo

Aren't you in the same competition as other guy in other thread? He was asking the similar question.
11. ## Riddle

My guess is 999 because it's resourceful.
12. ## derivative (n) times!!!

My mistake. You don't have to use chain rule, because there's no other function in $\frac{1}{x}$. Rather you have to use logarithm differiaitation. I got the answer of $e^{\frac{1}{x}}(\frac{-lne}{x^2} + \frac{lne}{x})$. It might be wrong. What do you think? I have a question though. What is the derivative of $ln(e)$? Because when they are together, they produce only $1$. So if the derivative of ln(e) is 1, then the answer would be: $e^{\frac{1}{x}}(\frac{-1}{x^2} + \frac{1}{x})$ or rather $e^{\frac{1}{x}}(\frac{-x+x^2}{x^3})$.
13. ## derivative (n) times!!!

You need to use the chain rule to find the first derivative of $e^{\frac{1}{x}}$. Can you tell us what you got?
14. ## Should I Attack my Wife?

That's right. It's just a special silver chain necklace.
15. ## Should I Attack my Wife?

I don't see why your daugther can't wear jewelry, because she won't get hurt from wearing it. I'm a Christian myself, and I still wear necklaces. In fact, I am wearing this necklace for two straight years without removing it because it is very valuable to me. My mom gave it to me for my sixteenth birthday. Maybe your wife is just a firm believer comparing to me.
16. ## Science-Facts

A human fact stated that more germs are transferred by shaking hands than kissing. Of course, it's true, because you shake hands with strangers rather to kissing your partner.
17. ## The rarest element

Ah, understood. My apologies.
18. ## The rarest element

jdurg, did you read my Element 118 thread at all? "[Element 118] is also one of the shortest-lived, decaying in less than a millisecond." (extracted from the Element 118 thread)
19. ## Amount of food and belly size...

Those kids in Africa get abnormal big bellies, because their stomach is eating itself. I'm serious, eating itself. Eating its own organs for their source of energies.
20. ## Proof of FLT in the binary system

Victor Sorok, do you mind using Latex next time? No offence, but your posts are full of scribbles which means it's hard to read your assumed ideal proof. Thank you.
21. ## Japanese scientists cage light

How about this article from the January 2007 Discover Issue? Laser-Emitting chips Promise Ultrafast Computers by Curt Suplee Nothing is faster than light. So for decades engineers have tried to accelerate the pace of conventional, electricity-based computer chips by melding them with laser-based signal processors (like those used to send Internet data blazing through fiber-optic cables). In September researchers from Intel Corp. and the University of California at Santa Barbara announced they had found a promising way to achieve that long-sought goal. The corporate and university teams set out to develop a hybrid design that could handle both electricity and light. They bonded a thin layer of indium phospide, a compound that acts as a medium for the laser, onto sillicon sheets by exposing both materials to a blast of hot, electrically charged oxygen atoms; the indium phosphide was spiked with aluminum gallium indium arsendide to give it added speed. A microlayer of oxides then formed on the two surfaces, gluing them together. "We can make thousands of lasers with just one bond, as opposed to bonding each laser individually," says John Bowers of UC Santa Barbara, coinventor of the new device. When energized by electrical current, the bonded layer produces light that travels through channels in the sillicon to a "modulator" that flickers the light tens of billions of times per second. A couple dozen lasers switching at this speed could handle a trillion bits of information per second - more than 100 times as fast as current sillicon chips. What wonders will such power bring? For one thing, Bowers and his team say, by the end of the decade their new chips could make it possible to download a feature-length movie in just a few seconds. There is a picture of the new hybrid sillicon chips and there's a caption below and it says, "Sillicon-laser hybrid chips could make computers 100 times faster". This looks like a promising new technology for computers, eh?
22. ## The rarest element

How about Element 118? http://www.scienceforums.net/forum/showthread.php?t=24245
23. ## Merry Christmas!

Lets hope a new year will brings us new experiences and fonding memories!!
24. ## Can a student with no science background excel in science?

By bat sonnar, you mean bat sonar.
25. ## Mnemonics for Pi

I thought so. Do you guys want me to put up more cool mnemonics?
×

• #### Activity

• Leaderboard
×
• Create New...

## Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.