Staredit Network > Forums > Null > Topic: What.
What.
Sep 24 2011, 12:28 am
By: Aristocrat  

Sep 24 2011, 12:28 am Aristocrat Post #1





I call bullshit. That site claims that the real answer is 1.34 x 10-6 nm.



None.

Sep 24 2011, 12:30 am Fire_Kame Post #2

wth is starcraft

Is that MathXL or some variant? :awesome:




Sep 24 2011, 12:32 am Aristocrat Post #3



Something like that, yes. Online homework that the professor assigns en masse because he is too shitty of a teacher to actually teach.

And he he he talks like like um like this during lectures. Quite naturally, listening to the lecture is about as educational as watching a brick wall weather in the elements.



None.

Sep 24 2011, 12:33 am Fire_Kame Post #4

wth is starcraft

Oh. If it was MathXL, I'd tell you to go back to the practice problems, find one like it and choose the "show me" option, it used to help me.




Sep 24 2011, 12:37 am Sacrieur Post #5

Still Napping

I got 1.34e-6 nm :wtfage:



None.

Sep 24 2011, 12:43 am Aristocrat Post #6



Quote from Sacrieur
I got 1.34e-6 nm :wtfage:

Relativistic effects. At 2.96 x 108 m/s, the sqrt(1 - v2/c2) factor in the equation can no longer be approximated as 1.



None.

Sep 24 2011, 12:49 am Vrael Post #7



Quote from Aristocrat
Quote from Sacrieur
I got 1.34e-6 nm :wtfage:

Relativistic effects. At 2.96 x 108 m/s, the sqrt(1 - v2/c2) factor in the equation can no longer be approximated as 1.
"Estimate" the wavelength. So approximate everything, lolololol.



None.

Sep 24 2011, 12:56 am Aristocrat Post #8



If only I can approximate away loan interest rates like that, Vrael >_>.

EDIT> Here, try out these two questions:


Tell me what you get. If you are not stupid, your answers will be the same as what I obtained, however, the system will rule them as incorrect.

Collapsable Box


Post has been edited 3 time(s), last time on Sep 24 2011, 1:11 am by Aristocrat.



None.

Sep 24 2011, 12:55 pm poison_us Post #9

Back* from the grave

Quote from Aristocrat
Collapsable Box
The degrees I could argue that they rounded to the nearest whole degree, even though that would ignore significant figures, but the first question is so bizarrely "off" that I can't even tell what they did. They did give the measurements in Imperial units for the copper wire and are asking for SI units, so I'd assume, especially since the "correct" answer is considerably less than yours (which I will assume is right, I only went through part of the problem at this point), the error lies in them not converting to SI units.

EDIT: Though looking at the problem again, you're both saying just a few kg of Cu can be stretched out to 3/4 of a km, or just over a km. At that point, it just becomes asinine to split hairs; it's a good fucking stretch imo.





Sep 24 2011, 6:09 pm DT_Battlekruser Post #10



I agree.. it is significantly wrong to take ɣ=1 when the velocity is about 0.986 c. Exactly, I got 2.122 x 10-7 nm



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