Exercises Definition and 170 Threads

Exercise is any bodily activity that enhances or maintains physical fitness and overall health and wellness.It is performed for various reasons, to aid growth and improve strength, preventing aging, developing muscles and the cardiovascular system, honing athletic skills, weight loss or maintenance, improving health and also for enjoyment. Many individuals choose to exercise outdoors where they can congregate in groups, socialize, and enhance well-being.In terms of health benefits, the amount of recommended exercise depends upon the goal, the type of exercise, and the age of the person. Even doing a small amount of exercise is healthier than doing none.

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  1. Y

    Solving Mathematical Method In Physics Exercises

    Hello! My English is poor because I'm from Poland. I have 3 exercises from subject called: Mathematical Method In Physics. Would you be so kind and help me to solve this: 1. (a) Prove that: {1 \over r}(rV)''=V''+(2/r)V' (that was easy, but next point (b) is not) (b) Use equation from...
  2. H

    Find Online Exercises for Your Stuff | Anybody Knows?

    Anybody knows where I can find some online exercises about this stuff? Thx
  3. R

    Cos/Sin Rule Exercises: Challenges and Solutions

    Hey guys, We've been learning cos/sin rule since the 1st of school, and i really had difficulties with the following exercises, I've been working them yesterday for 2-3 hours and could only manage to do part of it... 1. IN Quadrilateral ABCD, AB=7 cm, BC= 8cm, CD=5cm and angle ABC=52...
  4. B

    Solving Intermolecular Bonding Exercises: B2H6, CH4, NH3 & H2S

    Hi. I need help with (part of) this exercise: c) By considering the differences in bonding determine which of the combustion reactions (in part a) I have written combustion reactions for the following hydrides: B2H6, CH4, NH3 and H2S) must be expected to have the lowest energy of activation...
  5. F

    Looking for Challenging Physics Exercises? Any Recommendations?

    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...
  6. benorin

    A Geometric Product (a series of exercises for the curious)

    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+...
  7. K

    Exam exercises: Quantum mechanics

    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...
  8. C

    Where can I find a Calculus book with extensive exercises?

    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
  9. H

    Proving B^2=B & Finding det(B) | Linear Algebra Exercises

    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!
  10. L

    Asking for answers to exercises of peskin's QFT?

    thanks for advices.
  11. H

    Galois theory exercises

    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...
  12. Y

    Where to Find Grade 10 Math Exercises Online?

    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...
  13. C

    Where Can I Find General Physics Questions for Exam Preparation?

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

    Online electronics solved exercises needed

    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...
  15. E

    Vector Exercises: Solve for a & b

    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...
  16. A

    How to study Physics and Calculus (looking for exercises)

    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...
  17. A

    Online Electrical Engineering Exercises

    online exercises?? is there any website that provides online exercises for electrical engineering??
  18. 1

    Divisibility Rules and Counterexamples: Exploring Number Theory Concepts

    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...
  19. 1

    Is There a Contradiction in the Brain Teaser with Positive Integers x and y?

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

    Exercises on Partial Derivatives

    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...
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