Going through addition mechanisms of alkenes, and I've run into a stumper. I am wondering why bromination (which is normally an anti addition) of trans-anethole can sometimes produce minor amounts of syn addition, whereas cinnamic acid and trans-stilbene can not. All three of these molecules have resonance stability due to their phenyl groups. I cant see why trans-anethole would be favored for a syn rxn. Plz halp.
what's the best way to self-study? when i'm reading the cs/math books everything makes sense, but i can't seem to REALLY grasp the underlying principles and really move deeper. I'd hate to ask people questions and getting my hands held every couple pages just to double-check if i'm on the right track. am i just dumb? how do ya'll study and learn new concepts/theories? t-thx
>>7638749 That's a bit vague. Anyway, after you have finished reading something, you can try solving the exercises at the end of the chapter. It can actually makes you deepen your understanding. Doing exercises is what you should have done anyway. If you are not used to reading, then for most of the time, your thinking process will be really skewed and limited. There are things that can be seen only when you do exercise (i.e. work you brain more than reading).
If I have a simple signal sin(x), I can convert a sample taken at some point (x,y) on that signal to a complex number by using Euler's formula. e.g. the point (pi/2, 1) on the sine curve becomes complex number 0 + 1i on the unit circle in the complex plane.
What if the signal is not a simple sin(x), but is some arbitrary non-periodic signal? How do you convert an (x,y) sample into a complex number?
>>7638652 Pretty sure about this, but not completely. With your notation, a point (a, b) would become b * e ^ a*i = b (cos(a) + i * sin(a)) so in your example, (pi/2, 1) => 1 * e ^ (pi * i / 2) = cos(pi/2) + i * sin(pi/2) = i = 0 + 1i for a general function f, its representation at a point x is given from applying the above formula to (x, f(x)). (x, f(x))->f(x) * e ^ x * i = f(x)(cos(x) + i * sin(x))
>>7638685 That's the part that was making me not completely sure. It's a system consistent with the example you gave, but I'm not sure it's correct. I'm thinking that f(x) will be the magnitude of the complex vector and x will be the vector's angle.
Nope, it's a viable alternative to uranium/plutonium plants. The only reason that it's not as popular is that building a nuclear power plant costs a lot of money and the companies building them need huge subsidies from the government to start. And the politicians don't want their names to be associated with nuclear because it makes them unpopular.
If you where to go in an elevator step on a scale and go down you would "weight less" Because of the normal force being reduced.
Is this because since force is mass times acceleration and when you go down you accelerate downward therefor cancelling out the normal force? Also what if you stopped accelerating and went at a negative velocity (Downward) would the normal force already be cancelled out from before and not come back?Also what if you where to move faster than gravity (-9.81) would you experience a "negative normal force" or like complete cancellation... Comment too long. Click here to view the full text.
If I shine a flashlight into a handheld mirror, obviously the light bouncing off the mirror is moving at the speed of light. Now if I give the mirror a quick snap of the wrist, I've just increased its speed beyond that of light to Light + the Speed of Wrist Snap. And I didn't achieve infinite mass or anything. Conclusion: faster than light travel is possible.
In accordance with real economics (any case) analyze the following statement: “Consumers will not start spending again, until laborers go back to work and producers begin making a profit” Can you help me /sci/ ?
Every time I study (which is hell already because I postpone and get distracted and shit) I forget the material learned within a few minutes. And retain maybe 10% after a day.
Currently I'm in engineering school and I'm failing because I simply can't remember things long enough for the test. This applies to everything from mathematics( I can't grip concepts for shit) to downright simple shit like bussines.
All trademarks and copyrights on this page are owned by their respective parties. Images uploaded are the responsibility of the Poster. Comments are owned by the Poster.
This is a 4chan archive - all of the content originated from them. If you need IP information for a Poster - you need to contact them. This website shows only archived content.
If a post contains personal/copyrighted/illegal content you can contact me at email@example.com with that post and thread number and it will be removed as soon as possible.