[Coda]

If you know the mass and acceleration of an object, then it doesn't matter what kind of force it is, you can find the magnitude of that force.

As for this particular question, though, you DON'T have the acceleration, and you don't have enough information to find the acceleration without solving the rest of the problem anyway.

[Potironette]

But then if I know the mass and the force, I can find the acceleration...right?

------------If I can't then you can ignore this bottom part because then that's probably what I did wrong------------
The original problem I had was: "An electron is released from rest in a uniform electric field of strength 400. N/C that points east. Neglecting friction and gravity, calculate the speed of the electron at a point exactly 1.00 mm due west of ts starting point, given that the mass of an electron is 9.11 x 10^-31 kg."

These were the two solutions I had. The first one I did was the top one, then found it was incorrect by checking it with the solution's sheet. The second one is more or less how the teacher showed on the solution sheet to do it.

Err, these are sort of blurry so if it's illegible I can type it out. It's question #2 (imgur wasn't letting me crop the first picture properly for some reason)

[Coda]

You made a mistake on your division. 6.4x10^-17 / 9.11x10^-31 = 7.03x10¹³ -- you lost the order of magnitude.

[Potironette]

Ahh so that was what my mistake was ><'. The answer looks the same for both now.
Thank-you! Now I know that both methods do in fact work.

EDIT: Err, do you have tips for how to check work? I check my work my going through the whole thing, or by being haphazard about where I'm checking things...which means I make the same mistakes a lot.

[Potironette]

What is "Wall Street"? I'm researching something for a school paper and came across this phrase:

"The industry’s dilemma is that the average American can only eat so much of that food – about 1500 pounds a year – and the total number of eaters in this country is growing by only one or two percentage points a year. Yet Wall Street demands that food corporations grow at a considerably faster rate."

Does that mean Wall Street literally or Wall Street as a metaphor for some sort of market system thing? Or maybe Wall Street is actually the system. I thought Wall Street was a place?

[Coda]

me·ton·y·my /məˈtänəmē/
noun
the substitution of the name of an attribute or adjunct for that of the thing meant, for example suit for business executive, or the track for horse racing.

[Potironette]

Oh, so I guess "Wall Street" means a big, fuzzy blanket term for "the direction these US marketing related things are going."

Metonymies are annoying when I don't see the particular one much ><

Thank-you!

[Coda]

As always, you're welcome! And now you have a word for a thing you already knew about but couldn't label.

[Coda]

[Potironette]

I should be doing homework but was trying to do that instead x'D. I didn't figure it out though. ...That question's going to haunt me for a while.

(not that I have a lot of homework, at least)

[Coda]

Don't feel bad. I didn't get it either. It's a troll. 95% isn't an accurate statement. It's more like 99.9999%. The smallest known solution has numbers that are ~70 digits long, and it requires a very advanced mathematical technique to solve it.

[Potironette]

70 digits long? A very advanced technique..
..Well, at least in the few hours I was messing around, I practiced multiplication x'D

[Coda]

At one point when I was working on it, I was staring down the cube root of 2/3...

[Potironette]

I typed "solve((a/(b+c) + b/(a+c) + c/(a+b), a)" on my school-issued TINspire. The calculator took a much longer time to load than I'd ever seen it load, then gave me a huge line that I decided not to look at all of o_o
----

Why is "electromagnetic" energy called "electromagnetic"?
I've just started learning about currents, and that means lightbulbs! So does electromagnetic energy have a lot to do with electrons?

I remember when I first learned about energy, the teacher was grouping energies with each other, but I forgot those groups :/

[Coda]

Moving electricity creates magnetism. Moving magnetism creates electricity. These two phenomena are so intimately related that they're really just ONE phenomenon, which we call electromagnetism.

Yeah, I was able to get it solved for one variable in Wolfram Alpha, but trying to back-substitute that result into the equation ended up just making a horrible, horrible mess with an x⁶ in the denominator and some stuff with nested radicals. Turns out it's not even theoretically possible to solve it that way, and you have to use some properties of Galois field theory (don't ask, I don't know) to do anything with it.

[Potironette]

How dangerous are short-circuiting batteries? Would it be safe to tape a wire from one end of a battery to its other end and leave it there?
(I have this science homework where we have a simulation that shows batteries burning when they connect with themselves..but I've never seen a battery burn in real life)