Homework Definition and 998 Threads

Homework, or a homework assignment, is a set of tasks assigned to students by their teachers to be completed outside the classroom. Common homework assignments may include required reading, a writing or typing project, mathematical exercises to be completed, information to be reviewed before a test, or other skills to be practiced.
The effects of homework are debated. Generally speaking, homework does not improve academic performance among young children, because children need more sleep to develop and grow. Homework may improve academic skills among older students, especially lower-achieving students. However, homework also creates stress for students and parents, and reduces the amount of time that students can spend in other activities.

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  1. A

    Sequence Homework: Finding Terms and Sum for a Specific Sequence

    Homework Statement Let a be a real number such that 1 < a < 2 ,{an} is a sequence defined by a1=a, an+1=|an|-1 (n=1,2,3...) And put sn=a1+a2+a3+...an i)Find the a4,a5,a6,a7 i)Find a4,a5,a6,a7 The Attempt at a Solution I don't even know how to start.Maybe someone could give me an idea.
  2. B

    What Is the Resultant Direction of the Electric Field at Rho?

    Homework Statement Find the direction of E at rho where is the electric field http://i.imgur.com/37ohyME.jpg Homework Equations F=KQq/r^2 The Attempt at a Solution I thought I might just have a vector pointing right from the +2Q and another pointing up from the +3Q and just...
  3. S

    Physics Homework Help - Force when kicking a ball

    Physics Homework Help -- Force when kicking a ball Homework Statement I have a few physics problems on my homework, I need help. A player kicks a 0.5kg ball with a force of 50N, what is the force on his foot? Homework Equations F = Mass * Acceleration The Attempt at a Solution...
  4. J

    Sketching Region R Bounded by Curves: A Homework Problem

    Homework Statement Sketch the region R bounded by the curves y = x, x = 2 - y^2 and y = 0. This is the initial part of an integral problem and I'm just curious about the method here. Homework Equations The Attempt at a Solution So, would it be proper to take the x = 2 - y^2...
  5. R

    Rotational Equilibrium Homework Help

    Homework Statement Answers were told to us to be F = 2.91 N Ft1 = 13.32 N Ft2 = 3.36 N Homework Equations Fx = Ft2 cos(θ) - F = 0 Fy = Ft2 sin(θ) + Ft1 - Fg = 0 Torque equation -FgDg - Ft2D1x cos(θ) + Ft2D1y sin(θ) = 0 The Attempt at a Solution I plugged in all of the information i had...
  6. J

    How should I attach the guy wires to my new tree for support in bad weather?

    Homework Statement I have just planted a new tree. To support the tree in bad weather, I attach guy wires from the trunk of the tree to stakes in the ground. I cut 32 feet of wire into four equal lengths to make the guy wires. I attach four guy wires, evenly spaced around the tree. I put...
  7. M

    Learning curve of EM? (Not homework)

    I'm taking a first year physics course and have been having a little trouble with the basics of Newtons laws and forces and whatnot, though nothing that can't be fixed with a bit more hard work. I'm looking ahead now and seeing a lot of EM material, and after kind of taking a brief look at...
  8. L

    Frustrating Exam Results Despite Perfect Homework & Quiz Scores

    I don't get it guys. 100% on all the quizes and homework. 42% on the final... Deptartment policy is that you have to get a 60% or above on the final to get a D no matter what your grade is. i understand integration by parts just fine, trig sub just fine, integration with trig functions...
  9. M

    Kinematics Problem Homework Help

    1. A car making a 99-km journey travels 38 km/h for the first 49.5 km. How fast must it go during the second 49.5 km to average 47 km/h? 2. Homework Equations ? 3. 47=.5(38+x)
  10. B

    Homework Task: Find the power of water

    Homework Statement Find the power of the water if it falls from the height (h= 20m), for every minute falls 80m^3 (Volume=80m3). Homework Equations P=A/t W = mg A = Fh P= Fv The Attempt at a Solution I attempted to find the mass first, but I couldn't find any formula to do so.
  11. E

    Particle Decay/4-Momenta Homework Help

    Im stuck on the first question of one of my homework sheets. Partly due to me being horrific at particle physics and lack of sleep (yay exam period) i just can't figure out what's happening and just been staring at it for an hour. Sheet...
  12. STEMucator

    Can a Sequence of Elements in a Nonempty Subset Converge to Its Supremum?

    Homework Statement http://gyazo.com/27a104e05c409c75611ee4250a89c790 Homework Equations Sup/Inf axioms as well as the ε-N definition. The Attempt at a Solution Suppose A is a nonempty subset of ℝ bounded above by ##M##. We want to show that ##lim_{n→∞} x_n = sup(A)## where...
  13. vela

    Homework Help Guidelines for Students and Helpers

    The guidelines below will help you avoid some common obstacles to getting help. Executive Summary 1. Choose an appropriate thread title 2. Use the homework template 3. Reproduce the problem statement accurately 4. Show us that you've thought about the problem 5. Do not simply post images of the...
  14. vela

    Homework Help Guidelines for Students and Helpers

    The guidelines below will help you avoid some common obstacles to getting help. Executive Summary 1. Choose an appropriate thread title 2. Use the homework template 3. Reproduce the problem statement accurately 4. Show us that you've thought about the problem 5. Do not simply post images of the...
  15. vela

    Homework Help Guidelines for Students and Helpers

    The guidelines below will help you avoid some common obstacles to getting help. Executive Summary 1. Choose an appropriate thread title 2. Use the homework template 3. Reproduce the problem statement accurately 4. Show us that you've thought about the problem 5. Do not simply post images of the...
  16. vela

    Homework Help Guidelines for Students and Helpers

    The guidelines below will help you avoid some common obstacles to getting help. Executive Summary 1. Choose an appropriate thread title 2. Use the homework template 3. Reproduce the problem statement accurately 4. Show us that you've thought about the problem 5. Do not simply post images of the...
  17. D

    What Is the Probability of Getting Exactly 50 Women in a Sample of 100?

    "Half of the population are men and half are women. What is the probability that in a 100 random sample, there are 50 women?" 0.5 right?!
  18. J

    Friction Force Calculation: 1500 kg Car on 4 Degree Incline

    homework question, please help! :) Homework Statement A 1500 kg car is parked on a 4 degree incline. The acceleration of gravity is 9.8 meters per second squared. Find the force of friction keeping the car from sliding down the incline. Answer in units of Newtons. Homework Equations...
  19. Z

    Homework Question: required reductions in SO2 and PM10

    Wrong place to post this. I apologize. I found the HW sectionHello All, I need to figure out how to solve this question really fast. I appreciate your help in advance. Also new to this, so if i posted this to wrong section I apologize in advance.You are an engineer hired to assess the air...
  20. S

    Homework: Matrix is invertible when rows are linearly independent

    Hi there, I have a homework where I have to do this: Prove that square matrix is invertible if the columns of the matrix are linearly independent. There is also a hint: You can help with the following statement: Linear transformation L: U->V is bijection when a vector space basis N for U...
  21. J

    Pump and water storage system homework help

    hi, for a task at school i have to design a pump and water storage system that will be able to work with a wind turbine to supply water from a well to a small community of about 2000 people. i am having some trouble finding information regarding these topics: -flow rate of pump -power of...
  22. J

    Pump and water storage system homework help

    hi, for a task at school i have to design a pump and water storage system that will be able to work with a wind turbine to supply water from a well to a small community of about 2000 people. i am having some trouble finding information regarding these topics: -flow rate of pump -power of...
  23. M

    Engineering Solving Circuit Problems Using KVL, KCL, and Ohm's Law - Homework Help

    Homework Statement http://i.imgur.com/ij4eHqM.png?1?5000 Homework Equations KVL, KCL, Ohm's Law, I guess The Attempt at a Solution Tried node analysis but I get 4 equations in 5 variables, so no specific solution. I don't think the circuit can be simplified either. A friend...
  24. M

    Homework questions in Thermodynamics for Chemical Engineering

    1. State what is "Kauzmann Paradox" and provide your own explanation (or solution) for the paradox and derive a unique explanation using different approaches. 2. If you observe a phase transition phenomenon in your own experiment, how to determine the whether the transition is binodal or...
  25. T

    Looking for confirmation on probability homework question?

    Looking for confirmation on probability! Sorry, posted in wrong forum. It was a probability question which is why I posted it here. Can someone move it to homework section if need be. Thanks! ------------------------------------------------------------------------- Can someone let me know if...
  26. L

    Finding the Center of Mass of a System of Rods

    Homework Statement Three uniform thin rods, each of length L = 22 cm, form an inverted U. The vertical cords each have a mass of 14 grams. The horizontal rod has a mass of 42 grams. What are the x coordinate and y coordinate of the system's center of mass? Homework Equations xcom=...
  27. E

    What is the shortest path a fly can take in a room with given dimensions?

    Homework Statement A room has dimensions 2.59 m (height) × 5.81 m × 6.09 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the shortest path...
  28. K

    Conceptual Physics Homework Questions

    Homework Statement A large barge filled with scrap iron is in a canal lock. If the iron is thrown overboard, does the water level at the side of the lock, rise, fall, or remain unchanged? Homework Equations None. I like math a lot but this class I'm taking is a prerequisite to...
  29. V

    Integration Homework: Finding Expression & Proving Result

    Homework Statement Find an expression for \cos 2\theta + \cos 4\theta + \cos 6\theta + \dots + \cos (2n\theta) Hence prove that \int_0^{\pi/2} \frac{\sin(2n+1)x}{\sin x} \ dx = \frac{\pi}{2} Homework Equations \cos 2\theta + \cos 4\theta + \cos 6\theta + \dots + \cos (2n\theta) and...
  30. K

    Kinetic Energy and Work Homework Help

    Homework Statement A 50 kg mass is pulled at a constant speed up a 20° incline which is 12m long and 4.1m high. μk = 0.32 a) find the work done by tension, T. b) find the work done by friction. c) find the work done against gravity. Homework Equations W = F x D Work = force x...
  31. K

    Kinetic Energy and Work Homework Help

    Homework Statement While merging onto a freeway, a 1900 kg car accelerates from 17 m/s to 33 m/s What power did the engine supply? W = 7.6 x 105 J F = 9500 N Homework Equations P=W/T The Attempt at a Solution Not sure how to find T.
  32. E

    Molality Calculation: How Much NaCl is Needed for a 0.35 Molal Solution?

    Homework Statement How many grams of NaCl must you add to 750g of water to make a 0.35 molal solution? Ans. 7.59g Homework Equations molality=\frac{mol_{solute}}{kg_{solvent}} MW of NaCl = 23 + 35.45 = 58.45 g/mole The Attempt at a Solution...
  33. A

    What forces act on the suspended mass and is it in motion?

    I cannot for the life of me figure out how to do this A light string has its ends tied to two walls separated by a distance equal to 7L/8 the length of the string. A 95 kg mass is suspended from the center of the string, applying a tension in the string. What is the tension in the two strings...
  34. Q

    Is this function correct? (Not a homework Question)

    I was bored and decide to make a function (yes, i am a bit weird). So I came up with this: f(x)=2x+3 g(f)= f+2 w(g)=g2+3 x=2 f(2)=4+3 f(2)=7 g(7)=7+2 g(7)=9 w(9)=81+3 w(9)=82 Is those working outs correct or not? If it isn't could you tell me where i got it wrong?
  35. 1

    Homework Help 3D vectors problem solving

    Homework Help! 3D vectors problem solving! Homework Statement the vector v=(1,√2,c) makes an angle of 60° with the positive z-axis. Determine the angles that v makes with the positive x-axis and the positive y-axis. Explain how many answers there are. Homework Equations dot product...
  36. K

    Conceptual physics homework, easy, but understanding

    Homework Statement Bronco Brown wants to put Ft =∆mv to the test and try bungee jumping. Bronco leaps from a high cliff and experiences free fall for 3 seconds. Then the bungee cord begins to stretch, reducing his speed to zero in 2 seconds. Fortunately, the cord stretches to its maximum...
  37. C

    MHB Confirm Answers on Homework Sheet: Subsequence Convergence

    Question from my homework sheet. Can someone confirm I've got these correct. Let (an)n∈N be any sequence of real numbers. Which of the following statements are true? Give precise references to the results in the Lecture Notes for those which are true. Construct counter examples for those that...
  38. J

    Physics Kinematics Homework Help ?

    Physics Kinematics Homework Help!? "While standing on a bridge 18.3 m above the ground, you drop a stone from rest. When the stone has fallen 2.50 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the ground at the same...
  39. A

    Linear Algebra - Homework help

    Homework Statement Let A and B be n × n matrices. Which of the following statements are always true? (i) If det(A) = det(B) then det(A − B) = 0. (ii) If A and B are symmetric, then the matrix AB is also symmetric. (iii) If A and B are skew-symmetric, then the matrix AT + B is also...
  40. E

    Indeterminant forms homework help

    Homework Statement lim{x\rightarrow∞} sqrt(x^(2)+5x+11)-x Homework Equations I know it is of type ∞-∞ The Attempt at a Solution I have worked this problem around to death, and I know I'm supposed to give them a common denominator to get ∞/∞ and use L'Hospital's Rule, but I end up...
  41. P

    Projectile Motion velocity homework

    Homework Statement A projectile is fired horizontally from a gun that is 55.0 m above flat ground, emerging from the gun with a speed of 350 m/s. a) How long does the projectile remain in the air? b) At what horizontal distance from the firing point does it strike the ground? c) What is...
  42. M

    Differental Equation homework (w/ calc 2 intergrals)

    Homework Statement Carrying capacity N of a population Assume: small population, dp/dt is proportional to P if 0<P<N then p(t) increases if P>N then P(t) decreases equilibrium means dp/dt = 0 Homework Equations dP/dT = KP(N-P) Solve for P(t) The Attempt at a Solution...
  43. heycoa

    Spherical waves, Optics, phase, homework help please

    The question is as follows: A point source emits a spherical wave with λ = 500 nm. If an observer is far away from the source and is only interacting with the light across a small area, one can approximate the local wave as a plane wave. How far from the source must the observer be so that...
  44. A

    Second year physics homework, thought I was capable and now am simply frustrated

    So I told my sister I could help her with her physics homework, having an old computer engineering degree, and this first problem she sends me has me stumped. If anyone is willing to help this busy and forgetful young man help his sister I would be immensely appreciative. Thank you in advance...
  45. N

    Clarification on set of assigned homework problems

    Hello everyone, For homework my instructor assigned problem from the book. To show which problems to do she wrote this: 4n + 1 N={1, 2, 3...}. Does this mean problems 5, 9, 13, . . . ? Thanks for any suggestions.
  46. C

    Calc II homework - substitution of definite and indefinite integrals

    It's been a year since I took Calc I, and I'm taking Calc II online this semester. This is technically a review problem from Calc I, and I managed the other seven, but I can't figure out how to solve this problem. 1.a Homework Statement ∫(a*sin(14x))/(\sqrt{1-196x^2} dx, evaluated at x=0...
  47. K

    How Do I Solve Complex Homework Questions Involving Chromosome Numbers?

    Homework Statement Please look at the pictured question below, I really have no idea how to solve the question. Thanks and Homework Equations The Attempt at a Solution there is no information about how the number of chromosomes related to the body part in my...
  48. Z

    Max Velocity of Electron in Pion Rest Frame: Homework Solution

    Homework Statement A pion in its rest frame decays into a muon and a neutrino. Find the velocity of the muon and its mean-lifetime in the pion rest frame. (I've done this part). The muon decays into an electron and two neutrinos. If the two neutrinos happen to travel in the same direction...
  49. L

    Physics - Relative Motion Homework Help

    Homework Statement A ferryboat, whose speed in still water is 4.00m/s, must cross a river whose current is 3.00m/s. The river runs from west to east and is 128m wide. The boat is pointed north. a) If the boat does not compensate for the flow of the river water and allows itself to be...
  50. A

    Help Finding The Tension Force of a String (Not a Homework Problem)

    I'm trying to put together a little physics project, and I've constructed a rudimentary stringed instrument using a 2-liter bottle and some string. The string is fed through the bottom of the bottle and wound around a small dowel at the top end, and a small hole has been cut near middle of the...
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