What is Exercises: Definition and 167 Discussions

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. E

    I Are many exercises in Schutz just too hard?

    Dear all, I am self-studying GR using A First Course in General Relativity by Bernard F Schutz. I am halfway through the course, trying to solve all the exercises. But I worry that I can solve maybe 80% of them, the remaining 20% I find them just too hard. I know I am no genius, and I don't have...
  2. F

    Elements of plasma kinetic theory, Bittencourt

    Homework Statement Consider the motion of charged particles, in one dimension only, in the presence of an electric potential V ( x). Show, by direct substitution, that a function of the form f=f(1/mv^2 + qV) is a solution of the Boltzmann equation under steady-state conditions. Homework...
  3. J

    MHB 7 Students, 7 Exercises: Min Phone Calls Needed?

    7 University students have to solve 7 hard exercises. In order to save time, they have decided to share them, so that each of them solves exactly one exercise. Then they will communicate via telephone, so as to share the solutions to the rest of the exercises. What is the minimum number of phone...
  4. UncertaintyAjay

    Proof Practice Ideas: Books, Exercises, & Theorems

    Could anyone recommend some books or exercises to practice proofs? Or even post some theorems to prove? Thanks in advance, Ajay
  5. T

    MHB Beginner Exercises on Prime numbers and Equality / Inequality proofs

    Does anyone know a good resource for exercises on these topics?
  6. G

    Exercises in continuum mechanics

    Hello Please forgive me if i am not posting in the correct forum. Also you may find my English a bit rusty since i am basically French Ok so i want to solve some exercises in continuum mechanics . The first exercise states : we have a stress tensor in a Cartesian coordinate system with the...
  7. W

    Feedback on Practice Exercises

    Hello, I am just looking for some feedback (whether my answers and reasoning is correct) on some practice exercises I am doing. The subject is currently Combinatorics (didn't see a category for that so i just placed this in general math). Problem 1: There are 18 mathematics majors and 325...
  8. T

    Exercises in Statistical Mechanics

    I'm enjoying Lennard Susskind's lectures on Statistical mechanics. I've briefly studied this material before, but I've learned a lot about more practical calculations from these lectures: he's used the partition function to derive all sorts of fun expressions, and to analyse the ideal gas and a...
  9. S

    Good problems and exercises in C, Python, Ruby and Scala

    I have previously learned C and Python. I'm just starting out with Ruby and Scala. But I need to become more proficient in these languages, so could someone suggest good sources of problems/exercises in each of these languages sources could include websites, books, etc.
  10. H

    Particle Mechanics exercises. Please help.

    Homework Statement Two particles A and B, of masses 2m kg and m kg respectively, are connected by a light inextensible string which passes over a fixed smooth pulley. The system is released from rest, with both portions of the string vertical and taut, while A and B are at the same height. Find...
  11. Domenico94

    Diodes Exercises: Engineering Student Seeks Help

    HI everyone. I'm an engineering strudent, looking for online material with exercises on diodes...anyone can send me a link here with explanations of the various exercises? Thank you very much :)
  12. O

    Algorithms learning materials and exercises

    Hello I'm teaching assistant at one university in Bosnia and Herzegovina (department for computer science) and I have recently been chosen to be an assistant at "Introduction to computer algorithms" subject. First few classes are based on mathematical background (induction, recursion, algorithm...
  13. F

    Is Extra Force Needed to Lift an Object Against Gravity?

    I'm going through a few exercises on Schaum's outline college physics, the section on work and energy. It says "In general, the work done against gravity in lifting an object of mass m through a vertical distance is mgh". So they are basically saying that the work donde to lift an object is...
  14. Breo

    [Undergraduate/Masters] Group Theory Exercises

    Homework Statement Exercises: https://mega.co.nz/#!YdIgjA7T!WmgIpFjCoO-elDyPtUkDNarm21sZ_xet6OTJndPGiRY Text: https://mega.co.nz/#!pVRxVKIC!RfFZiW2atRNj9ycGa4Xx_7Nu5FO4a1e6wmyQVLCcGlQ 2. Homework Equations The Attempt at a Solution This is what I made, obviously all help would be appreciated...
  15. C

    Doing undergraduate math exercises mentally

    Hey! I was wondering, is it a bad idea to solve a math problem mentally instead of writing it down? I recently got a copy of "Understanding Analysis" and try to read it cover to cover using this method. Should I? It resembles blindfold chess in a way.
  16. W

    Are Feynman Lecture Exercises Available Yet?

    https://www.physicsforums.com/showthread.php?t=471333 Is this book with exercise solutions out yet?
  17. M

    Two exercises on complex sequences (one about Mandelbrot set)

    Homework Statement . I am trying to solve two exercises about complex sequences: 1) Let ##\alpha \in \mathbb C##, ##|\alpha|<1##. Which is the limit ##\lim_{n \to \infty} \alpha^n##?, do the same for the case ##|\alpha|>1##. 2) Let ##\mathcal M## be the set of the complex numbers ##c## such...
  18. B

    Solved: EES Homework Questions for Thermodynamics Exam

    Homework Statement Hello! I'm studying for a Thermodynamics exam and I need to solve these problems in EES (Engineering Equation Solver). Below the questions, there's my resolution. Can someone confirm if they are right? 1) The vapor quality of water, using u=2000 kJ/kg and s=6 kJ/kg×K...
  19. I

    Apostol calculus volume 1, Solutions to the exercises in the book.

    Hi guys! I am studying Apostol calculus volume 1 on my own. I tried many times to find a solution manual to exercises in the book but I couldn't. I would appreciate your help in this matter. Any other advice will be much appreciated. Thanks, Abe
  20. Math Amateur

    MHB Matrix rings acting on right R-modules - Dauns - Exercises 1-5 no 2

    In Exercise 2 of Exercises 1-5 of John Dauns' book "Modules and Rings" we are given R = \begin{pmatrix} \mathbb{Z}_4 & \mathbb{Z}_4 \\ \mathbb{Z}_4 & \mathbb{Z}_4 \end{pmatrix} and M = \overline{2} \mathbb{Z}_4 \times \overline{2} \mathbb{Z}_4 where the matrix ring R acts on a right...
  21. karush

    MHB How many students are needed for the sit-up exercise problem?

    image of given problem https://www.physicsforums.com/attachments/1140 (a) . (i)well looking at the pattern $p=32+33=65$ . (ii) $q=99-p=99-65=34$ (b) $\frac{35}{2}$ (c) $\frac{35}{2}$ . on (b) and (c) do we have to consider the # of students on these?
  22. S

    Exponential distribution, two exercises

    Homework Statement Waiting time in a restaurant is exponentially distributed variable, with average of 4 minutes. What is the probability, that a student will in at least 4 out of 6 days get his meal in less than 3 minutes? Homework Equations The Attempt at a Solution If I...
  23. L

    Is there any book containing exercises about quantum mechanics?

    Is there any book containing exercises about quantum mechanics?With answers?
  24. T

    Cauchy's Theorem and Cauchy's Formula Exercises

    I am studying for a test I have tomorrow evening and have finally reached the final section. I'm not 100% whether or not I am approaching these questions correctly or not so please bear with me. I have four questions and am not sure whether it merits starting separate threads considering they...
  25. evinda

    MHB Exercises with Solutions of Calculus 2

    Hello everybody!Could you tell me where I can find exercises with solutions of Calculus 2 online?Thanks! :rolleyes:
  26. marcus

    Intergalactic message exercises (for LightCone tutorial)

    There's a tutorial wiki for Jorrie's calculator. It needs exercises that beginning learners can do to help them get used to using the calculator. IF YOU HAVE SOME IDEAS, feel free to make up exercises and propose them. Anybody can suggest material for a textbook. He might not like what you...
  27. tsuwal

    Where can I find organic chemistry exercises with solutions?

    I'm learning how to do ressonance hybrids and would like to practice. Thanks for your help!
  28. M

    Sequences and Series exercises text

    Hello, In Calculus 2, sequences and series are introduced and do I have to say that most of the examples are trivial and even the exercises are either trivial or those that require experience. I hope someone can suggest a book where one can learn solving not-so-obvious series problems that...
  29. M

    Need verification on a couple of solid mechanics exercises

    Like the tittle says.. I am practicing and wanted to make sufre I did it correctly. Forma this excersice the only doubt es en the las parte ( parte 5)... I am not sufre but i think I need to use .005 rather than .05
  30. M

    Calculating Acceleration with Varying Mass: Tutorial & Exercises

    hi, I want to calculate how is acceleration changing if I have changing mass, but constant trust i.e. : T = m*a a = T / m (I know it has to be calculus). Then again I also wan't to be able to calculate displacement and velocities etc.. Trying to find somewhere on the internet a...
  31. A

    Challenges with Proving Complex Equations in Logic Exercises

    so I'm having problems with logic exercies especially when it asks you to prove long equations like when you just use simple integers and then prove that like asqtb/a > 2 and such, ifind them very difficuly idk if it's just me ,i don't find other lessons that hard ...
  32. F

    How many exercises do I have to complete ?

    I'm taking PoMA-Rudin, do I have to complete all the exercises after every chapter to be regarded as understanding the material ? Does all the tools for solving the exercises lie in the material? Because I feel many problems require more than the textbook. Thanks.
  33. L

    Acting Improv Exercises: Tips to Improve Performance

    I take acting classes and I'm pretty good at working with a script, but when it comes to doing improvisation scenes, I'm terrible. I'm nervous and I can't think of anything to say. I've been looking for some exercises I could do by myself to train my mind to think faster in those situations to...
  34. O

    Exploring Central Forces: Orbital Mechanics Practice Problems

    Homework Statement 1) A satellite having a mass of 5000 kg describes a circular path around the Earth of radius 8000 km. Find (a) its angular momentum and (b) its potential, (c) kinetic and (d) total energy. Also calculate (e) the orbital period. 2) Assume the satellite in the previous...
  35. amarante

    Boost Your State Machine Knowledge: Exercises for Mealy and Moore Machines

    Hello, I am looking for any exercises about State Machines, Mealy and Moore Machines, so I could study for my test. I have already googled it, but it's kind of hard to find something. Does anyone recommend a book or site, with some good exercises? Thanks in advance
  36. Y

    Need exercises to accompany Khan academy

    I have been watching Khan academy, trying to teach myself physics but have realized I have no way to test what I have learned. I would be really grateful if anyone could give me a link to somewhere I could test myself. Thank you
  37. W

    Where Can I Find Challenging Exercises for Multivariable Calculus?

    Hi everyone. We will have a tough exam for multivariable calculus which contains subjects like series, vectors, partial differentiation, multiple integration. Im currently studying on Stewart's Calculus and Adams Calculus: A complete course but I am not sure the problems in these books...
  38. DeusAbscondus

    MHB Seek a good online source of exercises and worksheets with answers and worked solutions in pre-calc

    I'm doing an adult-education course this semester which aims to take the student from pre-calc to calc in 18 weeks. The materials on offer at the course (for which I only have 3 contact hours a week) seem pretty slight to me. Does anyone know of a good online source of exercises and worksheets...
  39. C

    Four proof that exercises about taylor polynomials

    Four "proof that" exercises about taylor polynomials Homework Statement Definition: A function f is called C^n if f n times derivable and if the n-time derivable f^(n) is continuos. If is from class C^n then its called f ε C^n Exercise 1) Be f ε C^n in the interval [a,x]. Be P a polynomial...
  40. D

    What are some solved exercises on graph connectedness in graph theory?

    Hello, I've been looking for solved exercises on graph connectedness, but I can't find any. I'm supposed to compose my homework mainly of exercises with detailed solutions, but so far I've only got the theoretic part and pictures of the graphs. Could you give me any links where I could find...
  41. C

    2 exercises on changing variables of double integrals

    Homework Statement a) \int\int_{B}\frac{\sqrt[3]{y-x}}{1+y+x} dxdy, where B is the triangle with vertices (0, 0), (1, 0), (0, 1). b)\int\int_{B}x dxdy where B is the set, in the xy plane, limited by the cardioid ρ=1-cos(θ) The Attempt at a Solution a) Let ψ: \left\{u = y-x, v =...
  42. M

    Intro physics - how many exercises do you do?

    Intro physics - seeking some help/opinions I'm studying for some upcoming exams. I feel like I've been able to grasp the material but at the same time, there's this voice in my head which keeps nagging me because I haven't done every question the book (and some more from other books). At some...
  43. K

    Proofs, Exercises & Mathematica - Training the same skills?

    First post on this forum, that IMO is amazing! I was reading the introduction of the book “A gentle introduction to the art of Mathematics” and I was wondering about what the authors wrote on whom the book is for. In particular he stated that the book is in particular for people who can...
  44. D

    Learn to solve physics exercises

    Hello all. I don't have much time.. I'm studying applied maths and I've got a mandatory course of physics. I find it the hardest of all courses. Despite the fact that physics exercises are based heavily on math, I hardly succeed in solving it. What I seek to develop is, specifically, an...
  45. B

    Struggling with Spivak's Exercises: Building Mathematical Maturity

    For around 90% of Spivak's exercises, I need to look in the solutions manual. I'm on chapter 5, which covers limits, and the proofs just aren't coming to me. It's as if I just can't think like him. The question is: Should I come back later, or should I just trudge through until I have...
  46. L

    Quantitative risk management exercises?

    I have an upcoming written exam in a class on quantitative risk management (in the style of Quantitative Risk Management: Concepts, Techniques, and Tools by McNeil, Frey & Embrechts), covering concepts such as: - risk factors and loss distributions (conditional and unconditional) - mapping of...
  47. S

    Did any of my classmates cheat on their homework?

    I'm having some troubles about some exercises regarding my first year logic course. 1) Deriving (P -> Q) \/ (Q -> R) and showing that this statement is a tautology without using truth tables or venn diagrams. So far I have no clue on how to start this question. From what I remember in...
  48. G

    Exercises of Schutz's First Course of General Relativity

    Exercises of Schutz's "First Course of General Relativity" Dear all, does anybody know where solutions to the exercises can be found? I remember that I found a link in the Web once but I forgot where. Thanks, Goldbeetle
  49. A

    Finding Solutions to "Introduction to Algorithms" Exercises

    Hi, I'm studying algorithmic on "Introduction to algorithms" by Cormen, Rivest, Stein and Leiserson. This book is very well done and proposes more than a thousand exercises, but the point is these exercises are not corrected. It enables us to really search them, but it is frustrating when you...
  50. M

    Searching for Physics Olympiad Exercises? Need Help!

    Well I've been looking for sites that offer physics olympiad type exercise but i can't find any. If you guys know any good sites, that would be a big help thank you very much.
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