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1. Comunidad
2. Study Group
3. Physics: centripetal acceleration: worked example video

a = ω²r and you double the radius, a doubles.v = ωra = (ω²r²)/r If we wanted to plug this equation by saying that v^2 = 2ωr,(4ω²r²)/(2r) = 2ω²r which is indeed the same result for a. I'm afraid you...

1. Comunidad
2. General Khan Academy Questions
3. Grade different in different places around the world

Hello Heather, I have to rather disagree. I've seen and have been inmersed into several different education systems and all of them are great if you study. I don't understand very well your questio...

1. Comunidad
2. General Khan Academy Questions
3. Green Guy On Course Page Still Has Empty Crown Even With 100% Mastery and Good Course Challenge Score

Circle mouth guy is not smiling because you have 9.160/9.200 mastery points. You can try the Mastery Challenge in order to master that one exercise you still haven't fully mastered. 

1. Comunidad
2. Classroom Product Questions and Feedback
3. Feedback on questions

You can try to contact the content creators. Keep in mind that if everyone had that mentality of disagreement with the creators, they couldn't answer all of us. Specially math is not a subject of o...

1. Comunidad
2. Study Group
3. Physics Help

Yeah so basically, your graph is a function that relates force (y-axis) and acceleration (x-axis). If we use Newton's Second Law: F = m*a, we get that the slope of all this functions is not other t...

1. Comunidad
2. Study Group
3. Limit

So if I've understood it correctly: lim x-> 0, lim y-> oo f(x) * g(y). We indeed have an indeterminate form of the type 0 · oo. There are several ways to solve like-wise indeterminations. The probl...

1. Comunidad
2. General Khan Academy Questions
3. Am I missing important insights and material by only doing exercises and mastery challenges?

frs.veerman I've watched the video. Great video. Now, the answer is no. You are not skipping any content if you don't do the quizzes. The quizzes are just the same as those basic exercises but conc...

1. Comunidad
2. Technical Issues and Workarounds
3. Bio saving issue

I'm not sure at all about the following statement I'm about to say. I think that inside bios there are some limitations. For instance links or special characters. But again, I'm not sure at all if ...

1. Comunidad
2. General Khan Academy Questions
3. Am I missing important insights and material by only doing exercises and mastery challenges?

Hello frs.veerman. The optimal strategy to use Khan Academy is to go module by module inside any topic. Take for instance 6th grade. The goal is to get 100 %. To do this the best way possible is to...

1. Comunidad
2. Content Requests and Feedback
3. The Grand Computer Programming Expansion

Correct, Quinn Hardbrook. Sal original idea was a place to learn programming in an elementary way. The KACP community was almost another world inside KA. Everyone contributed, from Pamela to John R...