Exercises — 166 discussions

Hello everyone! My question is simple. Is there some website with really good and tricky physics exercises? I'm in 12th grade but I have also been studying and practicing by myself for some time now. I need 12th grade topics but with harder level questions. Any ideas would be great...

I hope you have fun with these... OK, so you know the geometric series, right? It goes like this: \sum_{k=0}^{\infty} z^k = \frac{1}{1-z},\forall z\in\mathbb{C}\mbox{ such that }\left| z\right|<1 How about this one? Call it, say, the geometric product: \prod_{k=0}^{\infty} \left( 1+...

Hi all! This is my first post... so have mercy on me o:) We had an exam from computer technologies today and there were only 8 of us loosers who still didn't pass it :blushing: and no one is sure about the correct solutions: 1.) What is wave frequency of 0,5m long whistle sound? What is...

Hi everybody, I am searching for a Calculus book that is focused on exercises and not on theory. I am studying multivariable functions and I need a book with lots of solved exercises. I especially want to focus on the double,triple,surface and line integrals. Any suggestions?? Thanks

B is a n*n matrix 1. Let B^2 =B. Prove that either det(B) =1 or B is singular. 2. If Transpose(B) = B^-1 , what is det(B)? Sorry I am asking, but I can't figure them out! I'd really like to improve my linear algebra skills. Thanks!

thanks for advices.

I haven't studied Galois theory, just seen some exercises on it. However I would like to know how one can solve this problem: Show explicitly that \mathbb{Q}\left( \sqrt{2},\sqrt{3},\sqrt{5} \right) is a simple extension over \mathbb{Q} . I don't think I will understand the solution, but...

Hi Does anyone know any good sites that offer Grade ten math exercises? It's for my sister. Canadian grade ten math, she's doing stuff like quadratic equations, factoring, linear equations. Also can someone explain to me why when you factor an equation with the quadratic equation the answers...

Can somebody suggest a few website with lots of general physics questions? I need them for my preparation for exam. Please help. Thanks.

Hi there all! I am sitting for an electronics subject for an Applied Physics course I'm studying here in Greece, but as the educational system does not make you attend the courses (in class), I don't have any solved exercises on Electronics! I made a quick search all over the net, found...

Hello Everyone, In school I had a test of Vector exercises. The problem is that I have to submit them online and I need the exact value for the questions. Anyway I don't want you to solve them for me. I just need some help where I am stuck. The first exercise: A boy runs 3.3 m North, 7.1 m...

Hi! I am a high school student, and I am planning to go to IPhO next year, so I am trying to study a little hard and deep Physics and Maths (Calculus, also some other parts that are necessary). However, I am reading a Feynman textbook, so I haven't exercises to do. And the other books that I...

online exercises?? is there any website that provides online exercises for electrical engineering??

hey i have more problems that can really exercise the mind! here are 3. 1. prove if q is divisible by (r +s) then either q is divisible by r or q is divisible by s. 2. if d>0, (fd+ed) = d(f,e). proof. 3. a divisible by b => a^m divisible by b^m a,b,m are in Z+. i think i have...

if x and y are pos. int. then rx >=y. x is an int. help!

here there are Exercises on Partial Derivatives: http://www.uAlberta.ca/dept/math/gauss/fcm/calculus/multvrbl/basic/partl_drvtvs_exrcss/partl_dervtv_exrcss.htm can comeone please solve the first two problems (for some reason i can't read the answers). my answers: 1. 3(3xy-4y^2)^2(3x-8y) 2...