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. J

    Homework, electric field strength at centre of a square

    Homework Statement 4 charges of +5µC, +3µC, -4µC and +2µC form the 4 points of a square of side length 2m. Calculate the field strength and potential at the centre of the square. Homework Equations F=1/4πhttp://upload.wikimedia.org/math/d/3/c/d3c305fc416b971cd6d284564e51bf85.png0 X Q1Q2/r2 E=...
  2. S

    Why do we do (homework) problems?

    It isn't until recently that I have really taken to heart the idea of really understanding and doing homework problems. I feel like I'm learning at a much more controlled pace if I work along with problems in a book (example: solving them before reading the solution), but aside from this, is...
  3. H

    Definite Integrals Using Contour Integration

    Problem Show: \int_0^\infty \frac{cos(mx)}{4x^4+5x^2+1} dx= \frac{\pi}{6}(2e^{(-m/2)}-e^{-m}) for m>0 The attempt at a solution The general idea seems to be to replace cos(mx) with ##e^{imz}## and then use contour integration and residue theory to solve the integral. Let ##f(z) =...
  4. E

    Solving Box Pulling Problem: Accelerating Comics to Stuart's Store

    Homework Statement Sheldon moves a box of comic books to stuarts comic book store by attaching a rope to the box and pulling with a force of 90 N at an angle of 30. The box of comic books has a mass of 20 kg and the coefficient of kinetic friction between the bottom of the box and the sidewalk...
  5. DataGG

    What's the protocol for when someone solves our homework question?

    Hey there, Back in PF-3 we had the "thanks" button, which we could use to thank whoever solved our HW question. We don't have that feature any longer, which begs the question: What's the protocol for when someone solves our homework question? Should we "like" the post? Should we reply with a...
  6. A

    Solving for Space Vehicle Acceleration: Homework Statement

    Homework Statement The first stage of a space vehicle consumed fuel and oxidizer at the rate of 1.60 104 kg/s with an exhaust speed of 3.05 103 m/s. Find the acceleration the vehicle had just as it lifted off the launch pad on the Earth, taking the vehicle's initial mass as 3.00 106 kg...
  7. K

    Kinetics Problem: Finding time distance and initial velocity

    Homework Statement You are riding in a hot air balloon at an altitude of 167 meters traveling at a horizontal speed of 24 m/s. If you fall out of the basket, how long will it take you to hit the ground? How far will you travel horizontally in this time. What is your total speed when you hit the...
  8. petormojer

    Help with physics homework on forces?

    Homework Statement A ball is held by a vertical tether C. The vertical tether C is held be tethers A and B (which are slanted). Tether A has an angle of 30 degrees. Tether B has an angle of 60 degrees. The ball has 150 Newtons. The system is in an equilibrium. What are the Newtons in theaters...
  9. R

    Solving 2-Part Homework: Tips & Strategies

    Homework Statement 2. Homework Equations [/B] See question The Attempt at a Solution Ok 1a) is dead simple. But I am struggeling with part b. I plug in all the variables. But cannot seem to get a and b... I do this: (-b)(S_x)(a,b) = E(a,b) and then get -b^2h/2= Ea and ah/2=E I don't...
  10. L

    Finding Solutions for Intricate Homework Problems

    Homework Statement Hi there! So I'm working on an old homework problem for review so that I actually have the solution, but I'm not sure how to compute a certain part. Here it is: $$\int \int rcos^2(\theta)dr - r^2cos(\theta)\sin(\theta)d\theta$$ Homework Equations The solution involves (what...
  11. R

    How Do I Calculate the Volume of a Hole in a Metal Piece?

    I've got this problem with my HW. Would appreciate the help. Thanks. 1. Homework Statement A metal peace with the density of 10,4 g/cm3, has a hole on the inside. The metal weighs 8,2N in air and 7,1N in water. What is the volume of the hole? Homework Equations V = m / ρ m = Fg / g Maybe some...
  12. R

    Potential of concentric cylindrical insulator & conducting shell. Stuck on 2nd question

    An infinitely long solid insulating cylinder of radius a = 5.2 cm is positioned with its symmetry axis along the z-axis as shown. The cylinder is uniformly charged with a charge density ρ = 23 μC/m3. Concentric with the cylinder is a cylindrical conducting shell of inner radius b = 14.2 cm, and...
  13. J

    Partial Derivative Manipulation for Physical Chemistry Homework problem

    Homework Statement Given the functions Q(v,w) and R(v,w) [/B] K = v(dQ/dv)r and L = v(dQ/dv)w Show that (1/v)K = (1/v)L + (dQ/dw)v (dW/dv)r I have the problem attached if for clarity of the information. Homework Equations I assume everything is given in the problem. The Attempt at...
  14. T

    1d Kinematics Homework: Helicopter mailbag

    Homework Statement The height of a helicopter above the ground is given by h = 3.30t3, where h is in meters and t is in seconds. After 1.80 s, the helicopter releases a small mailbag. Assume the upward direction is positive and the downward direction is negative. Already solved for Initial...
  15. U

    Is Differentiability Equivalent to Continuity?

    (a) State precisely the definition of: a function f is differentiable at a ∈ R. (b) Prove that, if f is differentiable at a, then f is continuous at a. You may assume that f'(a) = lim {f(x)-f(a)/(x-a)} as x approaches a (c) Assume that a function f is differentiable at each x ∈ R and also f(x)...
  16. K

    Physics homework: acceleration, velocity and speed. help please

    Hello everyone, I have this physics assignment to do and I would sure appreciate your guy's input. My attempts to answer the questions are below. Could you please let me know if I'm correct or if I'm wrong or missing anything? Thanks a lot in advance! 1. When you drive a car, might you...
  17. A

    How Does Current Density Vary Across a Cylindrical Region?

    Homework Statement (a)The current density across a cylindrical region of radius R varies according to the equation: J=J0(1-r/R), where r is the distance from the axis of the cylinder. The current density is the maximum J0 at the axis r=0 and decreases linearly to zero at the surface r=R...
  18. ajayguhan

    Solving a Math Homework Problem: Images Attached

    Homework Statement I have attached the question in image format. Homework Equations The Attempt at a Solution I attached my attempt at solution as images. Kindly have look at them.
  19. C

    Digital Electronics Homework Help

    I need help in creating a weighted timing controller that uses 4-bit DIP switch (Weight), 1-bit DIP switch (Fast/Slow operation) and etc. The question is shown below. Creating a Weighted Timing Controller: A simple microwave oven has two cooking modes: a "Slow cooking" mode that operates on...
  20. PsychonautQQ

    Can't do this algebra on my physics homework .

    Homework Statement I've gotten to the point where I have ln(e^(-cx) - e^(-cy)) = ln(g) how do i solve this for x ?
  21. FOIWATER

    Inverted triangle homework question

    Homework Statement Write a recursive function void recurTriangle ( int n, char ch ) which prints out an upside-down triangle. The parameter ch is the character to be used for drawing the triangle, and n is the number of characters on the first row. For example, if n is 7 and ch is ’+’...
  22. C

    Calculus 1 Homework problem - Find limit without L'Hospital's Rule

    Homework Statement Lim ( 5+6x2)/(√(x3)) + 2x2 +1) x->∞ Homework Equations not allowed to use lhopitals rule The Attempt at a Solution first, i divided by x2, which yielded (5/(x2) + 6 + √(x)) / (2 + 1/x2 ) then i assumed that thelim x--> infi of 5/x2 = 0, lim x-->...
  23. STEMucator

    Is Zero Outer Content Sufficient for Function Integrability?

    Homework Statement 1. Suppose that ##f = 0## at all points of a rectangle ##R## except on a set ##D## of outer content zero, where ##f \geq 0##. If ##f## is bounded, prove that ##f## is integrable on ##R## and ##\int \int f dA = 0##. 2. Now suppose ##f## is an integrable function on a...
  24. P

    MHB Homework Help: Probability involving 4 digit password

    I am upgrading and this question i just can not process please help. I will be very greatful. Abigail needs to create a four-digit password to access her voice mail. She can repeat some of the digits, but all four digits cannot be the same. Determine, to the nearest percent, the probability...
  25. Feodalherren

    Why Do Professors Prefer Online Homework?

    I realize that there is significantly less grading to do for professors with online homework. The program does everything for you. However, from a student's perspective I absolutely abhor it. It makes me want to go postal when I have to re-do questions because of round of error (sometimes the...
  26. K

    Help with Chain-Conversion Homework

    Homework Statement The problem is as follows: Harvard Bridge, which connects MIT with its fraternities across the Charles River, has a length of 364.4 Smoots plus one ear. The units of one Smoot is based on the length of Oliver Reed Smoot, Jr., class of 1962, who was carried or dragged length...
  27. WannabeNewton

    Deriving the Adiabatic Expansion Relation for an Ideal Gas in Kinetic Theory

    Homework Statement (Pathria 6.11) Considering the loss of translational energy suffered by the molecules of a gas on reflection from a receding wall, derive, for a quasi-static adiabatic expansion of an ideal nonrelativistic gas, the well-known relation ##PV^{\gamma} = \text{const.}## where...
  28. J

    Homework help:A small plastic sphere with a mass of 2.60 X 10-15 kg

    Homework Statement "A small plastic sphere (with a mass of 2.60 X 10-15 kg) is suspended between two plates, with a potential difference of 265.4 V across the plates. The separation of the plates is 0.500 cm. The upper plate is negative and the lower one is positive. a)What type of...
  29. R

    How Do You Draw Feynman Diagrams for These Particle Reactions?

    Homework Statement For the following reactions draw Feynman diagrams, clearly labelling all the quarks, leptons and exchanged particles and stating the type of interaction involved (if more than one interaction could be involved give the most likely): (i) ##\pi^0 \to \gamma + \gamma##...
  30. C

    I would appreciate some help with my geometry homework

    2. A group of Japanese physicists works on a project where planar lines are in the form of solutions to equations a⋅x+b⋅y+c=0 where a , b , and c are fixed reals satisfying a2+b2≠0 . They need to know formulae for the images of the line a⋅x+b⋅y+c=0 in the following cases: 1. Under the...
  31. B

    Kink/Buckling Homework: Calculating Maximum Force w/ E295 Steel

    Hello I have a steel shaft which is loaded by a pressure force in axis direction. If I want to calculate the maximum force I have to proof if this is a kink according to Euler or not. For steel E295 there is a Lambda_p = 89 In my case I calculated that Lambda is 125 --> Lk/i --> i =...
  32. A

    Can Non-Numerical Methods Effectively Organize Qualitative Data?

    The best question I can ask at this point is this: is there a way to order things or arrange things of which it is not even possible to use numbers or any form of numerical counting?
  33. cpscdave

    Where Can I Find Online Resources to Pre-Learn Electromechanics?

    TLDR; I'm looking for a good online source for electromechanics material I can pre-learn prior to taking the course at university Hi folks, In the fall I'm starting my last semester of EE, and one of the courses we have to take is Electromechanics. We just found out who the professor is...
  34. M

    How Do You Calculate the Series Resistance for a Voltmeter Using a Galvanometer?

    A galvanometer of coil resistance 50 Ω deflects full scale for a current of 3.50mA. What series resistance should be used with this galvanometer to construct a voltmeter which deflects full scale for 35.0 V ? r=50 Ω I=3.50mA=0.0035 V=35.0v R=? I= V/R The Attempt at a...
  35. D

    How Do You Factor Complex Algebraic Expressions Like This Olympiad Problem?

    Homework Statement Factorate the expression a(1-b²)(1-c²) + b(1-c²)(1-a²) + c(1-a²)(1-b²) - 4abc Homework Equations Algebric identities The Attempt at a Solution It seems to be an olympic problem, and I can't find the right factors for it. I would really appreciate the help and, if...
  36. I

    MHB Finding Limit on 58(b): UGA Math 115 Homework #2

    is there any other way to find the limit on 58(b). its on page 3 of the link. http://www.math.uga.edu/~clayton/teaching/m115f09/homework/hw2solutions.pdf
  37. M

    Why Does the Divergence of r-hat Over r-squared Equal Zero?

    Homework Statement How divergence of r (cap)/ |r|^2 is equal to zero? Homework Equations r(cap)= x(cap)+y(cap)+z(cap) |r|^2 as x^2+y^2+z^2 The Attempt at a Solution I tried the problem and end up with with a different solution I took r(cap)= x(cap)+y(cap)+z(cap) |r|^2...
  38. H

    How can I solve for the roots of (z+i)^2=3-4i in my complex number homework?

    1. The problem. Given that z= 3-4i Show that z^2 = 3-4i Hence or otherwise find the roots of the equation (z+i)^2=3-4i 2. My attempt. The first part of the problem is strait forward z^2= (2-i)(2-i) then expand to get the desired result. Now the second part (z+i)^2=3-4i. Becomes z^2+...
  39. K

    Finding Equilibrium: Solving a Black Hole Parking Problem

    Consider two black holes: the left one has a mass M1= 5x10^30 kg, and the right one has a mass of M2= 9x10^30 kg, and they are a distance d= 3.0x10^6 m apart. A spaceship passing between them is having engine trouble and so the captain has to park the ship somewhere where he won't get sucked...
  40. ranju

    Capacitance homework problem help

    Why capacitance behaves as shortcircuited in uncharged state and why as open circuited when its fully charged..?? I am reallt doubtful..:confused: i=Cdv/dt...so if we r appyling a dc voltage ..in that case i should be zero.>! thn why short-circuited..??
  41. D

    I need Help one my one piece of homework in Physics

    you may act for an early morning walk. your may work 5m south and 12m east suppose you decided to walk further and go 4m south east and 6m west A.) how far are you from starting point and roughly in what direction? B.)Would you have gotten the same spot had you taken the steps in this...
  42. z.js

    Faulty electricity homework question?

    Hi, Hoping someone will be able to help me out with a electricity homework question that sounds a bit unreasonable to me. Homework Statement Question 8 (Read the section after Q4 first!) The I-V characteristics of a diode and a resistor to be used in a simple circuit with a varaible...
  43. A

    Calculate Friction Coeffs & Acceleration for Bigger Block

    1. Homework Statement :In the diagram,the coefficient of friction between the bigger block and the smaller block is μ1 and the coefficient of friction between the bigger block and the ground is μ2. Calculate the acceleration of the bigger block.(As seen in the diagram,M is the mass of the bigger...
  44. B

    MHB Solve Ramesh's Algebra 1 Homework on Ages

    Help me to solve my algebra 1 homework on ages Ramesh's father was 38 years of age when he was born while his mother was 36 years old when his sister four years younger to him was born. Then what is the difference between the ages of his parents? Thanks.
  45. E

    How Do You Find the Object Position for an Upright Image in a Concave Mirror?

    So I originally posted a thread for my optics homework listing every question from a worksheet AND my attempts. Apparently, it's seen as spam so I have tried and am now posting the second question. Homework Statement A concave mirror has a focal length of 40 cm. Determine the object...
  46. G

    How Well Do You Understand Atwood Machine Pulleys?

    Homework Statement A pulley with mass Mp and a radius Rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot. Mass M2 is larger than mass m1. The quantities Tn and g are magnitudes. 1) The magnitude of the acceleration of m1 is ...
  47. D

    How to Calculate Wave Velocity in a Tuned Violin String

    Homework Statement A tuned violin, with strings of 31.6 cm each, is placed in front of a speaker. When varying the speakers frequency between 500 and 1500 Hz, it was discovered that a certain string only vibrated at 880 Hz and 1320 Hz. Determine the velocity of the wave in this string...
  48. E

    Calculating Wavelength in Young's Interference Experiment

    So I got a warning for just posting questions so I'll do as best as I can to try and put effort lol Homework Statement A Young's interference experiment is performed with monochromatic light. The separation between the slits, d, is .50 mm, and the interference pattern on a screen L =...
  49. B

    How Should You Properly Ask for Homework Help in Online Forums?

    https://scontent-b-sjc.xx.fbcdn.net/hphotos-xap1/t1.0-9/10373973_306663899490733_8092061444466097264_n.jpg
  50. D

    Verify Your Illustration for Homework Problem | Check My Homework

    Homework Statement Did I draw the illustration to this problem correctly? https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpf1/t1.0-9/10383553_10152076982180919_2063892221195778510_n.jpg Homework Equations No equations are needed. I just want to know if I drew the illustration...
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