I honestly had to look up David in google just to see who he is because of how good a teacher I think he is, thanks again for the clear explanation of the subject!!!
@nirmitbatavia81927 жыл бұрын
Érchegyi Dávid just it is the problem of pepper
@liyemamthini66385 жыл бұрын
David David David,you are the definition of a hella cool teacher
@aimbotbob50567 жыл бұрын
I love this guy idk y tho
@odeleyee8 жыл бұрын
that was beautiful
@virupannamedikinal Жыл бұрын
Thank you so much,finally got it
@crisen_4 жыл бұрын
It made me laugh when he said .. "we will get there I promised."
@endless7823 жыл бұрын
Thank you so much khan academy!
@amalguys17417 жыл бұрын
That great. Thanks you for this video
@herrschultz74138 жыл бұрын
This was... Amazing
@nirmitbatavia81927 жыл бұрын
u r awesome man
@charlieevergreen35148 жыл бұрын
David, I followed your steps, but am confused about the results not equaling 30N... 15N + 15 root3 N = 30N ? Where am I mistaken? (Also, sorry that I don't know how to type "root3" in proper symbols.) Thank you for these generous and skillful lessons!
@martinfederico72698 жыл бұрын
Charlie Evergreen same here, i don't know, I got T2=33.8 aprox. And that does add up... they should give some answer .@khanacademyphysics
@charlieevergreen35148 жыл бұрын
+Martin Federico I just re-watched this and realized that I was expecting the ropes' tensions to equal 30N, but that's not right; they would have more than that, because they are not perfectly vertical, so they have vertical AND horizontal tension. That's where the confusion was for me; the answer is supposed to be higher than 30N, as you found, too.
@woodychelton55902 жыл бұрын
@@charlieevergreen3514 yeah i struggled with this a lot. it doesn't seem intuitive that the two ropes tensions summed aren't equal to the blocks downforce in newtons. But in reality it's only the VERTICAL components that sum up to that. I think this has some interesting applications for how to multiply force to do more than what it would seem it could initially.
@danielepalmones64267 жыл бұрын
Whoa you can actually do that? Multiply a denominator to a side of the equations that's zero to remove it?
@alpacinomerbah7 жыл бұрын
welcome to math
@JonLG4906 жыл бұрын
@@alpacinomerbah lmaoo shiiiii
@peaches4free7 жыл бұрын
Isn't it the net force that is equal to zero, rather than a=0? I would have done mg=T1 + T2.
@kingplunger14 жыл бұрын
no
@jadanrakik77574 жыл бұрын
hey reverse it and get t1y and t2y i dont think it adds up to 30N...
@skeche7 жыл бұрын
I want some hot peppers now
@pantherplat37635 жыл бұрын
now tell me the acceleration of the can and in which direction
@dianchoiriah49194 жыл бұрын
the force is balanced so there'll be no acceleration tho
@woodychelton55902 жыл бұрын
no acceleration boss
@chiman37787 жыл бұрын
Why can't you just do T1=30sin(30) and T2=30Sin(60)?
@gam7017 жыл бұрын
That's what I was wondering because in the previous video they used the Force of weight as the y component for the ropes in the chalk board problem
@timothymiceli7 жыл бұрын
because if you do it that way then you're saying that the vertical component of each rope is equal to the weight of the can. That would make for a net force of 30 N up instead of zero. We can't even say the vertical component is 15 N in each since they are at different angles.
@davidgu56837 жыл бұрын
Nice name
@minecraftnation99407 жыл бұрын
I’ve done this for 10 different scenarios and each one matches with the long method
@minecraftnation99407 жыл бұрын
China N it works, if you look at the last couple minutes you’ll see that it works. I’ve done So many scenarios with different weights and they all come to the same conclusion as the long method here. 30(sin(60)) is 30(sqrt(3)/2)) which is 30/2 Times sqrt 3 and 30(sin(30)) is 30 Times 1/2 which is 15... like I said I’ve tried over ten weights and each tension in this shortcut has matched the long method
@oliverbetteridge67598 жыл бұрын
wow, but when i did it i just did T1=sin(60)x3 and T2=sin(30)x 3 and i compared my answer and i was off by a factor of 10.
@oliverbetteridge67598 жыл бұрын
oh my bad. i forgot to times the mass by gravity
@RGNSS-dp8st8 жыл бұрын
I clicked on this video because I thought it was about rope bondage. Hurry up with that video please.
@MFMegaZeroX78 жыл бұрын
Yeah, Khan Academy really needs a course on BDSM. Until then, 0/10, would not recommend.
@RGNSS-dp8st8 жыл бұрын
+MegaZeroX7 Yes. Shows great potential, but must try harder. ;)