Homework problem Definition and 419 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. S

    Electricity and Magnetism: Forces on Conductors in Magnetic Fields

    Homework Statement (i) What is the strength and direction of the force per unit length acting on a straight conductor carrying an electrical current, I, in a magnetic field, B? (ii) The figure below shows a square frame of aluminium set at an angle θ to the direction of a strong static...
  2. T

    Probability homework problem

    Homework Statement Bobo, Coco, and 8 other students are arranged to sit in 2 rows of 5 students. If these 10 students take their seat randomly, find the probability that Bobo and Coco are sitting in the same row but not next to each other. The Attempt at a Solution Bobo and Coco...
  3. P

    Explaining the Rainbow Colors in Thin Films: Interference Homework Problem

    Homework Statement When light is shined on thin films the interference pattern results in: a. there is no interference pattern *b. rainbow like colors c. light and dark pattern with no separation of colors d. a mirror quality reflection e. polarization of the light The...
  4. G

    Fluid Pressure Question (not a homework problem)

    It's spring break right now, so I thought I'd take the time to brush up on stat mech and thermo before classes resume next week... My question is this (Problem #1096 in "Problems and Solutions on Thermodynamics and Statistical Mechanics" Edited by Yung-Kuo Lim): A flask of conical shape...
  5. S

    Linear Algebra homework problem

    The set F of all functions from R to R is a vector space with the usual operations of addition of functions and scalar multiplication. Is the set of solutions to the differential equation f''(x)+3f'(x)+(x^2)f(x)=0 a subspace of F? Justify your answer I know that to prove that the set of...
  6. T

    Solving Double Integrals with Polar Coordinates: What's the Correct Approach?

    Homework Statement Find \int \left( \int \frac{x^2-y^2}{(x^2+y^2)^2} \;dx \right) dy. The Attempt at a Solution How would I go about finding \int \frac{x^2-y^2}{(x^2+y^2)^2} \;dx? If I made the substitution u^2=x^2+y^2 how do I go from here?
  7. C

    How Does a Gymnast Affect the Forces on a Balance Beam?

    Homework Statement A gymnast with mass m1 = 48 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 119 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end of the beam. Now the...
  8. G

    What Is the Probability of Drawing an Odd, Black, or Even Card from a Deck?

    Homework Statement a singlecard is drawn from a pack of 52 . what is the probability P((oddUblack)Ueven) Homework Equations The Attempt at a Solution P(oddUblack) = 26/52 + 26/52 - 13/52 = 39/52 so is the next part mutually exclusive( if you draw and odd in the first part it can't be even?)...
  9. T

    Optimizing Golf Shot Trajectory for a Hole-in-One

    Homework Statement A golfer finds that when he is at the driving range, he can send the ball a maximum distance of 250m before it strikes the level ground. Once on the golf course, the golfer finds that in order to get a hole in one, he must hit the ball so that is lands a distance of 200m...
  10. G

    Estimating Work for Rotating a Ferris Wheel

    George Washington Gale Ferris. Jr., a civil engineering graduate from RPI, built the original Ferris wheel. The wheel carried 36 wooden cars, each holding up to 60 passengers, around a circle 76m in diameter. The cars were loaded 6 at a time, and once all 36 cars were full, the wheel made a...
  11. S

    Solving Part A & B of a Circular Motion Homework Problem

    Homework Statement Part A : A 0.5 Kg ball is attached to a cord 80 cm long. The ball is whirled in a vertical circle at a constant speed. If the ball takes 0.4 seconds to go around once, what is the tension in the cord at the top and bottom of the circle? Part B How long does it take for the...
  12. N

    AP Physics Electric Field Homework Problem

    Homework Statement A has a charge of -2uC, and B has a charge of +3uC. Initially, there is no charge at point P. What is the electric field at point P due to charges A and B? Diagram given below, ignore periods; they were used solely for spacing purposes. ...(0,7m) ....P ....| ....|...
  13. G

    Fluids Homework: Density & Velocity Fields with Constants R, L, C, K

    Homework Statement Let R, L, C, K be suitable dimensional constants. In a certain motion of a fluid, the mass density function ρ is given in the Eulerian description by ρ = R*(x1^2+L^2). Is the velocity field v1 = C/(R*(x1^2+L^2)) e1 a possible velocity field? Is v2 = K*exp(-x1/L)...
  14. K

    Statics Homework Problem: Solving Forces Using Sin Law

    Homework Statement http://img843.imageshack.us/img843/5370/helpxd.jpg Homework Equations Sin law The Attempt at a Solution I got to: F1/sin(105) = F1u/sin(45) = F1v/sin(30) I get F1u = - 219 and F1v = 254.5... It says it is wrong, not sure what I did.
  15. F

    Homework Problem related to acceleration due to gravity and force.

    Homework Statement Bill throws a 10.0-g ball straight down from a height of 2.0m. The ball strikes the floor at a speed of 7.5m/s. What was the initial speed of the ball. Homework Equations Can you provide the proper formula and solution to solve this problem? The Attempt at a...
  16. C

    Calculating Time and Distance in a Relativistic Golf Game

    Homework Statement Consider Ahmad playing golf with Adam in a world whose light speed is only c = 3.40 m/s Ahmad, being at rest, hits a ball to a position 75 m away. Adam, riding a golf cart at constant speed 2.80 m/s relative to the golf course, passes by Ahmad the moment he hits the ball...
  17. X

    Solving a Mini-Lab Homework Problem on Velocity and Displacement

    Homework Statement For my class we did a mini-lab that asked us to stand still and long jump. Kind of confused about how to solve because our teacher is horrible. I am supposed to calculate the vertical velocity at take off (which I thought was 0m/s but someone told me it's at the peak of the...
  18. R

    Solving a Magnetic Field Homework Problem: Finding Mistakes

    Homework Statement [PLAIN]http://img718.imageshack.us/img718/3508/questionigu.jpg Homework Equations \epsilon = N \frac{\Delta \Phi_B}{\Delta t} = N \frac{\Delta (BA)}{\Delta t}=NA\frac{\Delta B}{\Delta t} The Attempt at a Solution The correct solution must be 6.54 mV. So we...
  19. R

    Solve for Net Force on Block C: Homework Problem

    Homework Statement Block C (m = 4 kg) sits on a frictionless horizontal surface. Block B (of m = 2 kg) sits on top of block C, and is attached to a rope that runs over the massless pulley as shown in the figure. Block A (m = 1 kg) hangs vertically from the rope. With what horizontal force...
  20. D

    Help with Difficult Physics Homework Problem

    Homework Statement Here is the picture: I have an upcoming test, and I cannot seem to get any questions like this one. Help is greatly appreciated. I calculated the net force, such that Fnet=ma. There exists a magnetic force due to the current in the wire. The mass m is negligible, ie...
  21. B

    Solving a 1000kg Weather Rocket Homework Problem

    Homework Statement A 1000 kg weather rocket is launched straight up. The rocket motor provides constant acceleration for 16 s, then the motor stops. The rocket altitude 20 s after launch is 5100 m. You can ignore any effects of air resistance. a) What was the rocket's acceleration during the...
  22. D

    Physics Tension Force Homework Problem

    I need some help with this problem. A ball of mass m is suspended from 2 strings of unequal length. The tensions in T1 and T2 in the strings must satisfy which of the following relations? The answer is T1<T2. I can't get a lucite in but T1 is on the left and sloping down to the right on an...
  23. N

    Heterogeneous/homogeneous chemistry homework problem?

    I'm doing some self practice problems for my chemistry class and stumbled upon this question which I cannot figure out. Here's a pic of the problem: http://img843.imageshack.us/img843/126/chemdiagramquestion.jpg" Can someone tell me what they get for the answers?
  24. K

    Homework problem on projectile motion

    Homework Statement Question: James and Steve have a contest to see who can kick a football further. James kicks the football at an angle up of 57 degrees, and a speed of 75m/s. Steve kicks the ball with a speed of 100m/s, at an angle up of 48 degrees? Who wins the contest? Vix=75cos57...
  25. C

    How Tall is the Tree in the Plane Mirror Problem?

    Homework Statement A woman stands between a vertical mirror, 0.5 meter tall, and a distant tree whose height is H. she is 1.0 m from the mirror and the tree is 9.0 m from the mirror. If she sees the tree just fill the mirror, what is H? Homework Equations m = (hi/ho)/(-di/do) hi =...
  26. K

    How to Begin Solving a MATLAB Homework Problem?

    Homework Statement Homework Equations Hi guys would like to know how to star this problem! Any help will be use full thanks The Attempt at a Solution
  27. V

    Solving a Delta Connected Induction Machine Homework Problem

    Homework Statement A \Delta connected induction machine is to start from a source of 480V, 60 Hz. The motor ratings are : 4 poles, \Delta connected, 480V, 60 Hz, X_{ls}\,=\,X_{lr}\,=\,4\,\Omega, X_m\,=\,50\,\Omega, R_s\,=\,0.25\,\Omega, R_r\,=\,0.4\,\Omega. Find the current in the...
  28. ?

    Why Is V_G at 0 in MOSFET Circuit Analysis?

    Homework Statement Homework Equations dI = \frac{\partial I}{\partial V_{GS}} dV_{GS} + \frac{\partial I}{\partial V_{DS}}dV_{DS}The Attempt at a Solution I was just wondering why \small V_{G} is at 0. I have solved the entire question (there are more parts :P), but I could only do it once...
  29. A

    How to Find a Vector Passing Through Two Points with Equal Magnitude?

    Homework Statement |Vp| = \sqrt{}3 Find a vector which is passing through (1,1,1) and (3,4,5) whose magnitude is equal to vector P. I have started studying vectors, and know the vector algebra rules, thought i do not understand the use of coordinates in order to find the direction...
  30. Z

    How can Fourier Transforms help explain the process of holography?

    I'm really having trouble understanding how holograms work in a good enough way to explain it. I know it captures an interefernce pattern of two incoming waves in the form of a complicated diffraction grating. When the reference beam shines on to the plate the original object is created. But...
  31. I

    Enthelpy confusion (not a homework problem)

    Hello, I have a question regarding enthalpy. I know that when calculating ΔS(o), you just do all of the products minus all of the reactants. However, when calculating ΔHf(o), I am confused as to what you include in the products and reactants? My book is sometimes disregarding some of the...
  32. H

    Verify Solution to Homework Problem

    Homework Statement I have a homwork question that I've been having some trouble with but have come up with a solution.. can someone please verify that I'm on the right path? The homwork problem is here http://i51.tinypic.com/bbeaf.jpg Homework Equationsvx= vocos(theta) vy=vosin(theta)...
  33. T

    How to Calculate Initial Molarity of S2O32- in a Trial

    Homework Statement Calculate the initial molarity of S2O32- in each trial given that each trial has 1.00 mL of .010 M Na2S2O3 and a total volume of 7.00 mL. Homework Equations mol = g/(g/mol) M1V1=M2V2 The Attempt at a Solution (1)(.01)=7x .0014=x
  34. J

    Hypergeometric Distribution homework problem

    Homework Statement A large company employs 20 individuals as statisticians, 7 of whom are women and 13 of whom are men. No two people earn the same amount. What is the probability that 6 of the women earn salaries below the median salary of the group? Homework Equations If r is the...
  35. J

    Diffeomorphisms homework problem

    Homework Statement Let A = \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix} . Write A as a composition of primitive linear diffeomorphisms. Homework Equations The Attempt at a Solution I want to make sure that I understand this question properly. Are they saying to find a...
  36. P

    How to Approach Oscillations Homework Problems

    Homework Statement I attached a file containing the problem statement, because it is impossible to reproduce all the symbols. Homework Equations Also in the attached file. The Attempt at a Solution I tried to simply substitute theta but it turned out to be very messy...
  37. L

    What Values of C Cause Resonance in a Linear System with Given Solutions?

    Hi, Say if the complementary solution to a linear system is A(coswt, coswt-wsinwt)+B(sinwt, wcoswt+sinwt) and the forcing term is (coswt, coswt-Csinwt), where C is constant How do I tell whether for what values of C is resonance going to occur? Thanks!
  38. P

    What Does the Tangent Line at x=0 Reveal About y=sin(x)?

    Homework Statement Find an equation of the tangent line to y = sin x at the point x = 0. Graph both functions on the same set of axes on the interval [-pie/4, pie/4]. What does this illustrate? Homework Equations y = mx + b The Attempt at a Solution y = sin x ---> y' = cos x...
  39. B

    Fourier series homework problem

    Not really a homework question; I typed this sum into Wolframalpha and it gave a nice, compact expression, but I couldn't figure out where to begin finding it. Is there a way to find it using just calc II-level knowledge of infinite sums...
  40. T

    How to Approach an Op-Amp Homework Problem with Earthed Terminals?

    Homework Statement See attachment. Homework Equations The Attempt at a Solution I am not familiar with questions like this. The usual op-amp i see have either of the terminals earthed so i need some hints to get started. Thanks.
  41. A

    What is the Convergence of the Geometric Series with Common Ratio 1/2?

    Show what: sum n.(1/2)^n converges to Now I know that sum (1/2)^n converges to 2 so can I use this some how
  42. T

    How Can I Prove the First Law of Cosines in a Hyperbolic Triangle?

    My course: Non- Euclidean Geometry I have been asked to prove the first law of cosines cosh(c) = cosh(a).cosh(b) - sinh(a).sinh(b).cos(gamma) I am told initially to proceed as follows: Explain why I may assume that T is contained in D (The hyperbolic disk) and also why V(c) = 0...
  43. C

    Homework problem dealing with frictional forces when a box is inside of a truck

    Homework Statement A 30.0 kg packing case is initially at rest on the floor of a 1500 kg pickup truck. The coefficient of static friction between the case and the truck floor is 0.30 and the coefficient of kinetic friction is 0.20. Before each acceleration given below, the truck is traveling...
  44. A

    Comp Sci How to Display Days in Order for My Clock: Java Homework Solution

    How to display days in order for my clock : Thursday, 12:00 pm Thursday, 2:30 pm Friday, 12:15 am Friday, 12:15 am Thursday, 2:30 pm Saturday, 2:30 pm I don't know how to do that. Con some pody help me out? I have problem in this code ,I couldn't figure out method to display days...
  45. kreil

    Spacecraft orbit homework problem

    Homework Statement Suppose a spacecraft of speed v_c is in a circular orbit around the Earth at a height H from the surface of the earth. The rocket motor is fired in the opposite direction of motion to reduce the satellite's speed to v_0 and make the orbit elliptical. Let R denote the...
  46. S

    What Is the Rate Law for the Uncatalyzed Reaction of Cerium and Thallium Ions?

    Homework Statement Cerium and thallium ions react as follows: 2Ce4+ (aq) + Tl+ (aq) ---> 2Ce3+ (aq) + Tl3+ (aq) This reaction is very slow and is thought to occur in a single elementary step. The reaction is catalyzed by the addition of Mn2+(aq) according to the following mechanism...
  47. F

    Solving a Physics Homework Problem: Work, Distance, & Normal Force

    Homework Statement A compressed spring is released pushing a block at rest along a level, frictionless path. This is Location 1. The block then passes over a small area of friction which ends and becomes frictionless again. This is Location 2. The block then enters a loop-the-loop in the...
  48. Y

    Finding potential using poisson's equation, not a homework problem.

    This is not a homework problem. I just want to have a better understanding of scalar electric potential. In electrostatic, \; V=-\int_A^B \vec E \cdot \hat{T} dl \; where the solution is: V=\frac{q}{4\pi \epsilon_0} \frac{1}{B} Where we assume \; A=\infty. At the same time, \vec...
  49. R

    Pulling a Sled: Solve the Homework Problem

    Homework Statement A girl is pulling a 6.5 kg sled by a rope. The rope make a 35 degree angle with the horizontal. Friction provides a resistive force of 15 N. a) If she pulls with a force of 70 N, what will be the acceleration of the sled? b)If she pulls with a force of 140 N, what happens...
  50. H

    Solving the Friction Wagon Homework Problem

    Homework Statement A wagon friction fore is 60N when moving, same for any load its carrying. A horizontal force is applied of 150N causes wagon to be accerate at 5 m/s/s. The same force with a child in the wagon causes it to accerate at 1 m/s/s how do I answer this question to find mass of...
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