Sensei

I am doing such calculations every day during purchasing and selling real stock shares.

Even wrote special application in C/C++ for it.

Yours must be simple excersise for school.

In reality you must take into account provision from brokers and stock market.

We have here 0.35% provision for buying through Internet platform,

calling to human broker cost much more and depends on amount of money in transaction, there used to be 1.5%-3.5%. Not following it by myself, as I am not using call-buy,

and if we sell same day, 0.2% provision for day trading, otherwise 0.35% for selling.

For instance, I buy 1000 shares for 14.

14 * 1000 * ( 1 + 0.35/100 ) = 14000 * 1.0035 = 14049, giving average 14.049 per share (not plain 14, as one layman could think!)

If I sell them for 14.1 the next day, stock broker will add to my account:

14.1*1000 * ( 1 - 0.35/100 ) = 14100 * 0.9965 = 14050.65,

and earned will be 14050.65 - 14049 = 1.65

(so if you buy and sell for the same price, you will be on minus, because of provision)

Additionally there is limit on how low can be provision (for now 5 if I recall correctly).

Above example is much bigger to show this.

This 0.35% is variable, and different broker house will have different price.

In my old one there used to be 0.39% and minimum provision 2. But they bankrupt two, three years ago. Had to switch to different broker house.

Somebody tried to cover mixer by teflon to see how it works? It's widely used as non-sticking surface in other areas.

Out in deep open space would the ambient/background energy be lower than here on earth?

Yes.

If you are thinking about energy coming from stars, obviously it follows inverse square law.

https://en.wikipedia.org/wiki/Inverse-square_law

And the largest energy will be coming from the nearest star, the nearest galaxy.

On the Earth we have [latex]1367\frac{J}{s*m^2}[/latex]

100 a.u from us, it'll be [latex]0.1367\frac{J}{s*m^2}[/latex]

(2.5 further than Pluto, somewhere close to aphelion of Eris)

the shock will be greater than the one received by a human Neanderthal confronted by current technology.

Any Neanderthal would think I am God..

Can be greater shock than that?

Is there a design that charges the car as it moves?

This way as the car moves, the battery is constantly being recharged, like an alternator.

While movement always with constant velocity, it can not work.

But while braking, kinetic energy of car, can be collected and reused.

Engineering: How To NOT Build Bridges..

More info

http://www.rtlnieuws.nl/nieuws/binnenland/terugblik-dit-gebeurde-alphen-aan-den-rijn

Good that nobody died.

Nobody talks about plasma and electric fields. Sensei, if you have such bizarre ideas, please don't suggest anybody else brought them.

What?!

Read posts you're replying to..

I said "Just a single step from making plasma"..

BTW, it's not bizzare idea.

It is/was widely used technique for receiving pretty pure isotope.

f.e. Manhattan Project Uranium purification.

https://en.wikipedia.org/wiki/Calutron

Thousands labolatories around the world that have mass spectrometers are using this technique in analyze/detection of chemical compounds they're working with.

Thanks for the suggestion!

If the acetic acid (vinegar) is added slowly enough, not sure you get many bubbles of CO2.

Get beaker 250 mL, add 50-100 mL of 10% vinegar, and add teaspoon of baking soda,

it will be so violent reaction of releasing CO₂, that you will most likely have table dirty..

50 mL 10% vinegar can give you nearly 2 Liters of CO₂ gaseous.

Some dissolves in water though, and bubbles will be around entire container.

How long does it take to remove water from sodium acetate?

Too many variables. Try it by yourself at home.

That depends on amount of water and power of hot plate, if you want to use it, instead of gas burner, or heating element, or alcohol lamp..

Class is only 50 min long, but realistically 35-40 min of lab time figuring setup and cleanup.

Making sodium acetate solid/hot ice is just addition to the main show of this experiment, which is just a few seconds long.

Take electronic thermometer with 0-100 C scale at least.

I have similar model to this -50 +300 C

http://www.aliexpress.com/store/product/Digital-thermometer-Food-thermometer-Air-condtioning-thermometer-Free-shipping-Temperature-range-50-300/912708_699014153.html

and you will show how temperature drops while releasing CO₂.

First timer, just to get that out there.. I've been contemplating the mysterious mechanism that triggers a nucleus to decay. Now I have no evidence as this is just an idea to be expanded upon, but the thought is that inside the nucleus of a radioactive atom there exists an as of yet undiscovered partical that carries strong and/or weak nuclear forces. As the unsuspecting atom travels through space/time flowing through the dark matter that has amassed around galixies throughout the cosmos, the as-of-yet-named partical crashes into a partical of dark matter annihilating both particals and releasing dark energy along with alphas betas and gamma radiation. Radioactive decay thus remains constant(here, engulfed in dark matter) yet still precisely unpredictable for dark matter is still absolutely unmeasurable by us..

First you should start from learning how to calculate energy released during decay of unstable isotopes:

http://www.scienceforums.net/topic/83451-radioactive-decay-and-information-split-from-what-is-real-in-physics/?p=808149

An experiment proving the correlation between dark matter and radioactive decay could be performed if we ever make it to intergalactic space. Once there, one could observe the rate of decay. Since there wouldn't be much of anything in that region of space, the decay should slow down dramatically as there would be no collisions between dark matter and mystery partical.. I could be dead wrong and proven so within the first comment but until then ponder away! I really hope this thread doesn't get deleted..

Satellites, especially the one which are traveling to outer regions of Solar System, where Sun light is very weak, are routinely powered by decays of untable isotope of Plutonium generators for years.

https://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator

I have mostly nitrates, chlorides and some sulfates to work with.

If it's not requirement,

how about f.e.

acetic acid + sodium bicarbonate (aka baking soda) -> carbon dioxide (gaseous) + sodium acetate + cold (put electronic thermometer to beaker)

Both can be bought in any supermarket.

Later you can get rid of water from sodium acetate,

and show "hot ice".

Acme, get 2 graduated cylinders

http://www.ebay.com/itm/5x-Professional-Graduated-Glass-Measuring-Cylinder-Chemistry-Lab-Spout-Measure-/311307912431

You will need them in other experiments in future..

15 usd for 2 setups, 8 graduated cylinders.

Or pick one of these

http://www.ebay.com/bhp/graduated-cylinder

(if you want to measure volume of gases during electrolysis or other experiment producing gas, get cylinder with dismountable plastic bottom, you will place it up-side-down during experiment)

You will be able to tell exactly volume of liquid in each of them.

I would place it in front of camera and record photo per minute or hour.

Then after week watch how water is evaporating, day by day,

being able to tell volume/day or volume/hour evaporation. Enter data to OpenOffice. And compare days, compare hours.

One could use also thermometer and barometer and use them in analyze of data.

While I am in accord with Sensei's advice to do the experiment, he did not actually do it and made the setup rather more complicated than it need be. Half credit to you Sensei.

I wanted to accelerate experiment with electricity (hot plate), and being able to calculate energy input to beakers, to not have to wait days for some results..

I was doing such experiments, but with different purpose.

 

I think there might be two opposing forces causing them to evaporate at the same rate: while salted water may evaporate slower, the overall percentage of mass that is H2O is less, so there is less water that has to evaporate overall.

Not if you start with the same mass of water

 

metacogitans was referring to already on going Acme experiment. He didn't pay enough attention at setting up. I doubt he used graduated cyliders to measure initial volume of water for instance. Also didn't measure mass of salt precisely.

I put two small bowls filled to the brim with water out 5 hours ago, one with 4 teaspoons of salt.

I measured my teaspoon, full of NaCl salt,

on jeweler's weight that has +-0.01 grams precision,

and 1 my teaspoon has 2.54 grams.

So your 4 was approximately 10 grams (if we have equal teaspoons), with 8 oz = 236 mL of water. Maybe 250 mL?

10 g in 250 mL ~4%, I wouldn't say it's heavily salted..

Electrolysis in early XIX century was used as the primitive ampere meter.

If you put two gold electrodes to water, and attach battery, amount of produced gases is straight depending on current I.

You can see electrolysis of water with gold electrodes on video:

https://www.youtube.com/results?search_query=electrolysis+of+water+gold

Q=I*t [A*s=C]

Power P=U*I [V*A=W]

and

Energy E=U*I*t=U*Q [V*A*s=V*C=J]

If voltage will be significant, water will be heated during this experiment. So we can read temperature increase.

Joule passed current through resistor placed in water, and heated water, reading temperature difference before and after experiment on thermometer.

Current I, and voltage U, and time can be read from ampere meter, voltage meter, and stopper.

https://en.wikipedia.org/wiki/Joule_heating

See radioactive isotope decay energy calculation

http://www.scienceforums.net/topic/83451-radioactive-decay-and-information-split-from-what-is-real-in-physics/?p=808149

Before event, we have sample with mass at rest,

after decay, "debris" newly made particles are often accelerated to relativistic velocities (they have large kinetic energy)..

Why don't you make experiment?
Fill water two equal volume cups (or beakers if you have equipment),
add some salt to one of them,
remember which one,
and see result after day or so.
Or even record it with timelapse rendering camera in front of it.
One frame per minute f.e.

Other, faster than Sun, experiment:
- place beaker with water (+ eventually some substance) on hot plate, connected to wattmeter.
I recommend this one

It has switch to change mode, watts/voltage/amerage/energy, shows time.

From wattmeter you know what amount of energy you added to beaker (E=U*I*t),

use thermometer to learn what is temperature f(time),

for various solutions.

Remember that there will be losts from idealized closed system (beaker and water will be releasing energy to environment while you are still heating it).

Compare different salts results.

Compare with distilled water result.

Most jobs cost money to learn how to do and not everybody can afford to learn.

That's one of problems in US. Learning should be free. Otherwise it's straight route to creation of castes.

People without money will be excluded from gaining knowledge, and remaining in their caste for generations.

your pc feels cold ? how come ?

He is using PHP and browser only

When CPU is not heavily crunching numbers all the time, it should be around ~50 C at most.

If you have single-thread cruching numbers app, it will use 12.5% of 4 core (8 HT) power Core i7/Xeon.

But if you have multi-threaded app, it could go to 100%, if there will be little I/O operations.

Modern BIOS has temperature detector on CPU and motherboard and if threshold is exceeded (you can set in BIOS), computer will shut-down.

I had such shut-downs last year.

And it was dirty cooler and lack of good silicon between CPU and cooler..

In your opinion, what is Americas biggest problem?

1. Constant running for money.

2. Lack/degeneracy of democracy. For fake reason "war with terrorists" there has been ripped off all citizen rights.

3. Lobbies from various industries bought your politicians and now they're telling what to do.

4. Corruption the next level, unprovable, not countable. f.e. instead of giving money straight away, hire child of some politician in company of friend of businessman. etc. sophisticated, complicated methods..

I would force them to sit on chair and connect lie detector to all of them, and ask right questions, and none would remain in office anymore..

It will happen, count on it. Robots work cheap and do not complain, let alone organize into unions.

 

They react faster and do only what their program specifies, no deviation, no fatigue, no human frailty. No discrimination, no sexual harassment, no maternity leave or substance abuse on or off the job.

If by "job" you meant something not requiring intelligence, right. That's good "job" for robots.

Humans should learn interesting and valuable things, and then use what they learned in productive way.

Moving boxes from one place to other place (f.e. warehouse), and similar muscle requiring jobs, are degenerating for humans.

You are already obsolete, have a nice day.

I am indispensable..

Somebody will have to program these robots, so they will know what to do.

Was it in the summer?

 

My current computer is 6 years old had to replace the power supply twice so far.

The next time, when power supply cooler will start dying and giving harsh sounds, replace it.

You will save some money on replacing whole power supply.

Wind cooler costed me $2.7, while complete power supply is around $40. Now I am replacing just wind cooler.

Power supply failure is typically caused by overheating, caused by malfunction of wind cooler (it's rotating thousand times per minute, engine have right to fail after 2-3 years of whole day usage).

I am currently running windows 7 on my pc. However a lot of employers are looking for knowledge of the Linux command line. Considering buying a second pc is out of the question I was told it might be possible to partition my hard drive and install Linux on the partition. But I am scared of doing it because if it didn't work properly I would lose my copy of windows 7 and any files I have. Does anybody know how to do this?

You don't need to buy new (modern?) PC.

You just need additional hard disk.

Either obsolete, or new one, 2 TB brand new is for ~$100, 1 TB for ~$50. Smaller you can find for free in neibourhood.

I can't believe somebody knowledgable in computers don't have plentiful of old computers.

I have more than 20+ old machines that I was using in the past around me.

Just plug off HDD from one of them and connect to PC. And in BIOS disable Win7 HDD (or disconnect cable temporarily), and enable booting from old one.

This way, this month, I made Win7 test OS on old Maxton 300 GB, used by me 5-10 years ago in some old machine.

After installing everything needed there is still 214 GB free..

W/Z bosons interact and guide QFD which allows for radiation, and isnt this radiation by QFD which spawns every photon in the first place?

Bosons W+, W- are Weak Force Bosons. Radioactive beta decay plus, beta decay minus, double beta decay plus, double beta decay minus.

If light is the gauge boson for the EMF, why cant I charge a magnet with light?

You can do reverse: rotate polarization of photons while passing through medium to which there has been applied external magnetic field.

https://en.wikipedia.org/wiki/Faraday_effect

Also read

https://en.wikipedia.org/wiki/Magneto-optic_Kerr_effect

Did you use stop loss option?

less fast food jobs

That's good. Fast foods in american way is straight way to degenerate people.

I don't know any other similar nation of fat people. You have not been like that 50+ years ago.

What happened? Unlimited cheap crap fast food? GMO modified food?

Hamburgers are good for drunk teens returning at 3 a.m. to home friday night, not as regular everyday meal.

Increased food prices

The more people will be cooking from scratch, the better for their healt, and cheaper for pocket.

Pre-made not healty food like fries should be higher priced to people with limited funds (and lack of self discipline) force to buy regular potato and cook it in pot.

It's healtier and cheaper (if they won't add liter of pre-made crap sauce...)

Really healty pre-made food should be very cheap, nearly as cheap as raw contents they are made of.

f.e. set up of chinesee vegetables 450 grams with prepared seasonings cost me today $1 equivalent in Auchan market.

Once they were in promotion for 2 weeks for $0.75, I was buying them every single day.

Chicken fillet 300 grams, $1.2. It's fried for 6 minutes, vegetables for 3 minutes.. Is 9 minutes for meal ready enough fast.. ?

Chinese fast food in US = unhealty (what to expect?) noodles... Ridiculous!

When "restaurant" with chinese take away noodles opened shop here, they bankrupted in a year..

Price was fine, taste also.

You could save even more storage space, if you would introduce banks of available answers for some fields.

f.e. assign chemistry=1,physics=2,mathematics=3 etc.

and then use 1,2,3 instead of full-text versions.

BTW, XML is highly extendable. One can write loader/saver which ignores unknown tags and attributes (from older/newer version of software) and there is high chance it'll work.

Your's solution, won't. It's very limited, not extendable.