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. W

    Electrophysiology Quick Homework Problems

    Homework Statement Hi guys, I've been trying to solve these two questions for the last hour and can't seem to find the solution, any help would be very much appreciated. :smile: 1. An RC circuit is given a step voltage (charging) of V at t = 0 seconds. What is the value of voltage at t = 2RC...
  2. generalguiness

    Will a 27N Push Move a 50kg Object on a Surface with 0.6 Static Friction?

    Homework Statement A 50kg object begins at rest on a surface with a static coef of friction at 0.6. If you push horizontally on the object with a force of 27N, how quickly will it move across the surface? Homework Equations The Attempt at a Solution[/B] This is from Trivium Praxis test prep...
  3. S

    A block of mass m=0.2 kg, is pushed by a spring of stiffness k=300 N/m

    I am currently taking a physics class and I'm studying for the final and I've been stuck on this problem and haven't been able to find help from the book nor help from online. The professor said the answer was .56m, but I've been trying formulas for about an hour now and haven't been getting...
  4. R

    Determine the angular frequency of the system in SHM

    Homework Statement Determine the angular frequency of the system in the image. The cable is ideal but the pulley is not. I will present the same solution but with different coordinate axes. For some reason they arent the same and neither of them are correct. Given data: R is the radius of...
  5. E

    One Variable Statistics Homework Question

    Homework Statement A set of eight numbers has a median of 19. a) What is the sum of the fourth and fifth data points b) What is the sum of the fourth and sixth data points (no answers available) Homework Equations (N+1)/2 -- Position of the median (N+1)/4 -- Position of Q1 3(N+1)/4 --...
  6. E

    Values of x for which a geometric series converges

    Need help with a homework question! The question gives: The first three terms of a geometric sequence are sin(x), sin(2x) and 4sin(x)cos^2(x) for -π/2 < x < π/2. First I had to find the common ratio which is 2cos(x) Then the question asks to find the values of x for which the geometric series...
  7. H

    How to use the coefficient of kinetic friction?

    Homework Statement A child is playing with their Hot Wheel cars. They have set up a track which is initially horizontal but then ascends to a second horizontal section which is 50 cm higher than the initial track. The track is friction-less until the car reaches the upper section of the track...
  8. T

    Orthogonality of Gravitational Wave Polarizations

    Homework Statement Two plane gravitational waves with TT (transverse-traceless) amplitudes, ##A^{\mu\nu}## and ##B^{\mu\nu}##, are said to have orthogonal polarizations if ##(A^{\mu\nu})^*B_{\mu\nu}=0##, where ##(A^{\mu\nu})^*## is the complex conjugate of ##A^{\mu\nu}##. Show that a 45 degree...
  9. S

    Thomas Young's Double-Slit Experiment Problems

    Homework Statement Determine the wavelength of light being used to create the interference pattern in 3 different ways from the given data. -The angle to the 8th maximum is 1.12° -The distance from the slits to the screen is 302 cm -The distance from the first minimum to the fifth minimum is...
  10. D

    C/C++ C++ Homework Help: Calculate Product of Numbers

    I am not looking for an answer, just guidance... My assignment is to ask the user for a number between 3 and 10 (inclusive). Using a loop, calculate the product of the numbers between 2 and that number. For example, if the user chooses 5, the result would be 2 x 3 x 4 x 5 = 120. Sample run...
  11. allanwinters

    Grade 12 chemistry homework help -- 2n^2 electrons possible in each energy level

    Homework Statement A classmate says "Since there are 2n^2 electrons possible in each energy level, and the atom with the greatest number of electrons has 118 electrons, that must mean that u is the highest possible value for n, because a value of 7 gives 2n^2 = 98 nad a value of 8 gives...
  12. alan

    Range in solid surface for liquid-liquid phase separation

    I am investigating the nucleation on solid surface during liquid-liquid phase separation, I know the free energy change is and I don't know if it is correct to get Can someone calculate it to have a check?
  13. alan

    Temperature and volume fraction of a liquid mixture

    I have known the interaction parameter of a certain liquid mixture which has the phase behaviour can be described by the lattice model. , is it possible for us to know the temperature at the critical point? Besides, if we know the temperature at the critical point, can the volume fraction of...
  14. alan

    Isotropic material fitted by Ornstein-Zernike form

    I have known what Ornstein-Zernike equation is. I try to plug in the form as follow to the isotropic materials: Still, I cannot show the pair correlation function as follow. Can anyone know what I have missed?
  15. harini07

    What enzyme is responsible for the initial step in milk digestion in humans?

    Homework Statement The intial step in the digestion of milk in Humans is carried out by which of the following enzymes? A) lipase B) trypsin C) rennin (No, not renin) D) pepsin Homework Equations Casein is converted to Paracasein by rennin and then paracasein along with calcium is acted upon...
  16. StillLearningToronto

    How Much Kinetic Energy to Accelerate a Proton to 0.9999c?

    Question: Calculate the kinetic energy required to accelerate a single proton from rest position to 0.9999c. The mass of the proton is 1.67*10^-27 kg. Equations Used: Ek=(mc^2/√ 1-(v^2/c^2))-mc^2 Attempt at the problem: Ek=(1.67*10^-27kg)(3*10^8m/s)^2/√...
  17. NoahCygnus

    Kinematics: Find average speed from displacement-time graph.

    Homework Statement The problem is as follows; A boy begins to walk eastward along a street infront of his house and the graph of his displacement from the house is shown in the figure. His average speed for the whole time interval is equal to...
  18. C

    How to find the optimum angle for takeoff for ski jump using

    Homework Statement I need to find how to find the optimum angle for take off on the ski flying hill using projectile motion. and why? Homework Equations The Attempt at a Solution [/B] I'm just confused, because would I just use all the formulas above to solve the problem? or do I have to...
  19. S

    Homework inequality -- Show that (a+1)(b+1)(c+1)(d+1) < 8(abcd+1)

    Homework Statement For a,b,c,d >1, Show that (a+1)(b+1)(c+1)(d+1) < 8(abcd+1) Homework Equations How to show this? The Attempt at a Solution I could show for two variables, (a+1)(b+1)<2(ab+1). Tried C-S, AM-GM inequalities in different form and variable transformations. But still no result...
  20. jlmccart03

    Find ratio of diameter of two Cylindrical Resistors?

    Homework Statement Two cylindrical resistors are made from the same material and have the same length. When connected across the same battery, one(A) dissipates twice as much power as the other(B). Find ratio of dA/dB. Homework Equations P = VI = V2/R = I2R Area of cylinder = 2πrh + 2πr2 The...
  21. jlmccart03

    Total energy within a specific region.

    Homework Statement A cubical region 1.0 m on a side is located between x=0 and x=1 m. The region contains an electric field whose magnitude varies with x but is independent of y and z: E=E0(x/x0), where E0 = 32 kV/m and x0 = 6.0 m . The answer needs to be in μ J. Find the total energy in this...
  22. Cheesycheese213

    Mousetrap race car is not working

    Hello, so for school I'm building a mousetrap with my group for a project, but our car isn't moving. We filmed it snapping, and it doesn't seem like it is because of friction, since the axle spins pretty well. We thought that it was because the thing that holds the axle bends, but after fixing...
  23. John A

    Acceleration of couch pushed by non-horizontal force

    Homework Statement An 82 kg couch is being pushed with a force of 56 N at an angle of 40o above horizontal. Friction is to be considered. Draw a free-body diagram representing this scenario.If the coefficient of friction between the couch and the floor is 0.051, what is the acceleration of...
  24. jlmccart03

    Calculating Capacitance and Charge Density: Solutions to Homework Questions

    Homework Statement Write an expression for the total charge on one of the plates of the capacitor. Is this total charge greater than, less than, or equal to the total charge on one of the original plates? http://imgur.com/enJ1wMy (It won't let me paste the image so this is the best I could...
  25. OnlinePhysicsTutor

    Solving Part B of a Homework Problem Involving Principal of Moments

    Homework Statement Please see attached picture Homework Equations principal of moments The Attempt at a Solution part a) is fine. For part b, I would Normally take moments about C. The force acting on BC at B must be the tension in AB. The geometry of the triangle gives and angle of 53.1 to...
  26. P

    Can I Solve This Mechanics Problem Without Any Help?

    So I have a multiple step problem for my mechanics class and the teacher decided to write his own solutions. I know exactly how to attempt and finish the problem. I know it will be wrong. Recently if I try things on my own there will be a slight gap in the knowledge or math, or magic physics...
  27. jlmccart03

    Find the magnitude of charge density for a power line

    Homework Statement The potential difference between the surface of a 2.2 cm -diameter power line and a point 1.9 m distant is 3.8 kV. What is the magnitude of the line charge density on the power line? Express your answer using two significant figures. Homework Equations V =...
  28. jlmccart03

    How Does Charge Movement Affect Electric Potential and Kinetic Energy?

    Homework Statement Two charged rods, each with net charge -Q0 are held in place as shown in the top view diagram below. a. A small test charge -q0 travels from point X to point Y along the circular arc shown. i. Draw an arrow on the diagram at each point to show the direction of the electric...
  29. A

    What is the approach to solving this AC circuit voltage problem using phasors?

    Homework Statement the problem is given in the attachment Homework Equations basic knowledge of ac circuits and phasor diagrams The Attempt at a Solution for point A , i calculated the potential easily. and for point B , i calculated the potential using phasor relationship .. now after doing...
  30. E

    Homework: Solving for Energy Conducted dQ/dt

    Homework Statement See attached figure. Ta>Tb. Show that the rate of energy conducted dQ/dt is 2*pi*L*k((Ta-Tb)/Ln(b/a)) Homework EquationsThe Attempt at a Solution I seem to be lost at deriving an equation for the medium area, A. I understand the tansfer from low temp area to high. Pcond. is...
  31. Poetria

    Complex exponentials - homework

    Could you give me a hint how to attack this problem? Find a complex number z = a+i*b such that f(t)=Re e^(z*t) where f(t)=cos(2*pi*t) I have begun as follows: e^((a+i*b)*t)=e^(a*t)*(cos(b)+i*sin(b)) Re e^(z*t)= e^(a*t)*cos(b) What to do now?
  32. jlmccart03

    Electric Flux through half a cylinder

    Homework Statement In (Figure 1) take the half-cylinder's radius and length to be 3.4 cm and 15 cm, respectively. If the electric field has magnitude 5.3 kN/C, find the flux through the open half-cylinder. The surface here is the right half of the surface of a full cylinder. The surface does...
  33. jlmccart03

    Electric Flux confusion and help

    Homework Statement I have three questions spanning three different situations, but each deal with the single concept of electric flux. Problem 1: Write an expression for the net electric flux through the entire surface in terms of the area vectors and the electric field E. Problem 2...
  34. jlmccart03

    Show Wolfram Alpha's answer is equivalent to my answer.

    Homework Statement Integrate x2(2+x3)4dx. Show that Wolfram Alpha's answer is equivalent to your answer. Homework Equations No equations besides knowing that the integral of xpower is 1/power+1 * xpower + 1 The Attempt at a Solution So I have the answer to the integral by hand as (2+x3)5)/15...
  35. peroAlex

    Current density of specific configuration

    Homework Statement Two hollow metal spheres (left one has radius of 0.7 meters and right one has radius of 0.4 meters) are half-submerged in the sea water with specific conductance of γ = 4 S/m. Distance between their centers is much greater than their radii dimensions and equals 60 meters...
  36. jlmccart03

    Finding magnitude and direction of net force on a dipole.

    Homework Statement A dipole with charges ±q and separation 2a is located a distance x from a point charge +Q, oriented as shown in the figure. Part A: Find an expression for the magnitude of the net force on the dipole in the limit x≫a. Part B: What is the direction of the net force...
  37. jlmccart03

    Magnitude of electric flux through a sphere?

    ****EDIT****: I had improper significant figures. It was the correct number. 1. Homework Statement The electric field on the surface of a 6.0 cm -diameter sphere is perpendicular to the surface of the sphere and has magnitude 52 kN/C . What is the magnitude of the electric flux through the...
  38. E

    Thermodynamics homework: Water heated in a sealed container

    Homework Statement Hello, i have the following assignment due for monday and i have truly no idea how to tackle it, i have already tried it many times but all my results have been wrong. the problem is as follows. inside a sealed container is an amount of water: mass=90.26 kg; pressure 9.1842...
  39. C

    Equilibrium Temperature with three substances

    Homework Statement If a block of 250 grams of lead (specific heat (c) =130) at 315 degrees celsius is placed in a 200 gram aluminum (c=900) calorimeter cup containing 900 grams of water (c=4.1), and the calorimeter and the water are both initially at 15 degrees celsius, what is the equilibrium...
  40. jlmccart03

    Find the electric field on a proton by an electron

    Homework Statement A proton is at the origin and an electron is at the point x = 0.36 nm , y = 0.34 nm. Find the x- and y-components of the electric force on the proton. Homework Equations E = kQ/r2 The Attempt at a Solution So I found that E = 9.38 * 10-28, but my problem is that I do not...
  41. lightofthemoon

    Electrostatic Potential / Work Question?

    Homework Statement An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. If a second electron is initially at 20 m on the x axis, and given an initial velocity of 350 m/s towards the origin, it does not reach it. How close to the...
  42. jlmccart03

    Find the electric field at x and y coordinates?

    Homework Statement A 60 μC point charge is at the origin. Find the electric field at the point x1 = 50 cm , y1 = 0. Homework Equations Coulombs Law: F = (kQ1Q2)/r2 Electric Field: E = kQ/r2 k = 8.99*109 C The Attempt at a Solution So taking Coulombs Law and deriving the Electric Field...
  43. A

    Physics 221 Calc-based question for homework

    Homework Statement If vector d1--> is equal to 2i^-4j^+9k^ and vector d2-> is equal to 8i^-10j^+9k^, what is (d1-->+d2-->) * (d1--> X 4d2->)? Homework EquationsThe Attempt at a Solution So I added up first two vectors and then multiplied it by the cross product but I get a vector and when I...
  44. C

    Why Does a Smaller Radius Increase Centripetal Force?

    Homework Statement My textbook states that, "Traveling in a circular path with a smaller radius of curvature requires a greater centripetal force". But my question is, why, and how is that true? I would have assumed at first that if the radius was getting shorter, then the centripetal force...
  45. C

    How Do You Calculate the Weight of a Block on an Inclined Plane?

    Homework Statement A block is placed on a inclined plane. The incline of the plane is 21° .A 24 N force is required to push the block up the incline with constant velocity. The force is applied at an angle of 15° as shown in the picture. The coefficient of kinetic friction (μk) is 0.26. What...
  46. 1

    Wavefunction in a delta potential well

    Homework Statement Using the equations given, show that the wave function for a particle in the periodic delta function potential can be written in the form ##\psi (x) = C[\sin(kx) + e^{-iKa}\sin k(a-x)], \quad 0 \leq x \leq a## Homework Equations Given equations: ##\psi (x) =A\sin(kx) +...
  47. G

    How Do I Solve Double Displacement Reactions for Chemistry Homework?

    I am so stressed right now and am on the verge of a nervous breakdown. My chemistry homework is just really confusing and I need to pass this class, could someone please help me out? I need to hand this in tomorrow and I have already answered the questions myself but I feel like my answers are...
  48. I

    Suggestions for practice problems in E&M

    Hey all, I am working my way through a couple of emag books (Griffiths, Jackson, and Schwinger) and I was wondering if any of y'all have suggestions for problems that you thought were particularly physically insightful or useful. Cheers, IR
  49. Fetchimus

    Infinite Square Well homework problem

    Homework Statement A particle of mass m, is in an infinite square well of width L, V(x)=0 for 0<x<L, and V(x)=∞, elsewhere. At time t=0,Ψ(x,0) = C[((1+i)/2)*√(2/L)*sin(πx/L) + (1/√L)*sin(2πx/L) in, 0<x<L a) Find C b) Find Ψ(x,t) c) Find <E> as a function of t. d) Find the probability as a...
  50. S

    Python Object-Oriented Implementation of Python ATM Script: Where Did I Go Wrong?

    hello everyone, I am a new member of this forum I found really good topics and good community that helps with many scientific fields. So I have this long text-based user interface for banking system written in python functions , but needs to be written using object oriented programming. I had...
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