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. F

    A homework in Direct Circuit for beginning students

    Homework Statement Left blank Homework Equations Left blank The Attempt at a Solution Well, I am not familiar with the Latex system on this website, just because I am a newbie and I rarely access to this forum. I have a problem (may be simple for you guys) but I still need a...
  2. J

    BJT Homework: DC biasing, VOC Amplification, Signal Amplitude

    Homework Statement the signal Vsig has a maximum voltage amplitude +-100mv Vcc = 15V, Rc = 2.2khom, Re= 200ohm, β= 100, Vf = 0.7V, Vce,min = 0.2V, VT = 25mV Assume the Capacitor having negligible impedance for the signal’s frequencies. Homework Equations a. Choose the DC biasing...
  3. M

    Physics homework problem - design a capacitor

    Physics homework problem -- design a capacitor Homework Statement An engineer needs to design a capacitor with a capacitance of 1*10-6F using a material with a dielectric constant 260. If the dielectric strength of the material is 8*106 N/C, and the maximum voltage that the capacitor is...
  4. R

    How Do You Solve Capacitor Equilibrium Problems?

    Homework Statement Homework Equations C =Q/V c = capacitence q = charge v = potential difference U = Q2 / 2C U = potential energy The Attempt at a Solution I'm just stuck on b. I tried doing Qeq= √(2UC) then using the fact that q1+q2 = Q which is Qeq since charge should...
  5. C

    Confirming Answers to Homework Questions

    Hi, I'm not really sure whether I've answered this question correctly. I'd really appreciate if someone could check my answers and point me in the right direction if I'm indeed incorrect. Thanks in advance. Homework Statement An aircraft has an air speed (speed relative to the...
  6. Mark44

    Hey I posted in homework help but now it's gone

    If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...
  7. Mark44

    Hey I posted in homework help but now it's gone

    If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...
  8. Mark44

    Hey I posted in homework help but now it's gone

    If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...
  9. Mark44

    Hey I posted in homework help but now it's gone

    If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...
  10. Mark44

    Hey I posted in homework help but now it's gone

    If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...
  11. Mark44

    Hey I posted in homework help but now it's gone

    If you posted a homework problem, and you don't see it any more, it might have been deleted by one of the mentors. The mentors routinely delete homework or homework-like problems where you haven't shown any effort at solving the problem. If your post is deleted for this reason, the mentor will...
  12. L

    What are the latest advancements in optics research?

    I have taken for this semester an optics course and my teacher will ask us to do a bibliographic research on an optic's subject of our selection. I was interested in finding good topics maybe with a research attention from the modern scientific world. Any ideas?
  13. R

    Calculating Current in a Mixed Tissue Conductor: A Weighted Average Approach

    The conductive tissues of the upper leg can be modeled as a 35-cm-long, 16-cm-diameter cylinder of muscle and fat. The resistivities of muscle and fat are 13 Ωm and 25 Ωm, respectively. One person's upper leg is 82% muscle, 18% fat. The resistivity of the whole leg will be a weighted average of...
  14. dirtybiscuit

    Calculating Probabilities for Sole Supplier Selection in Auto Industry

    Homework Statement Five companies (A,B,C,D and E) that make electrical relays compete each year to be the sole supplier of relays to a major automobile manufacturer. The auto company's records show that the probabilities of choosing a company to be the sole supplier are Supplier chain: A B...
  15. A

    Discover Tension in Systems I and II: A Physics Homework Question

    Homework Statement PLEASE click on attached picture below: What can be concluded about the tension in the cords holding the balls stationary in Systems I and II when both systems are at rest? In both systems the mass of the larger ball M2 is exactly twice the mass of the smaller ball...
  16. P

    Snell's Law Application Homework Problem

    Homework Statement I apologize for not utilizing built-in Latex, I'll have to work with that a little more.Question statement: Explain the paths, both transmitted and reflected, that a light ray of 400nm would take if it was incident perpendicular to the bottom face ofo the crystal. If the...
  17. D

    Why Does dV/V Equal ln(Vd/Va) in Physics Homework?

    Homework Statement See attachment In the first place I don't understand why you can just say: dV/V = ln(Vd/Va) ( was given in lecture slides) And I am not sure if my attempt to the solutions is any good... Hope Someren can help me a bit with b and c Homework Equations The...
  18. M

    Thermodynamics of Steam Homework

    Here is the question in my homework, but my response does not correspond with the answer given, even though I worked out the answer that was given backwards and it still does not work: Determine the quantity of heat required, to raise 7.7 kg of water at 90°C, to saturated steam at 1300 kPa...
  19. Feodalherren

    Solving for Visible Light Reflection/Transmission: A Homework Help Guide

    Homework Statement An oil film (n = 1.45) floating on water is illuminated by white light at normal incidence. The film is 280 nm thick. Find (a) the color of the light in the visible spectrum most strongly reflected and (b) the color of the light in the spectrum most strongly transmitted...
  20. S

    Maclaurin series homework help

    Homework Statement the maclaurin series for f(x) is given by 1/2! - x2/4! + x4/6! - x6/8! + ... + (-1)nx2n/(2n+2)! + ... a) Let g'(x) = 1-x2 * f(x) Write the Maclaurin series for g'(x), showing the first three nonzero terms and the general term. b) write g'(x) in terms of a familiar...
  21. U

    Probability of Sample Mean for Poisson Distribution

    Homework Statement A rectangular field is gridded into squares of side 1m. at one time of the year the number of snails in the field can be modeled by a Poisson distribution with mean 2.25 per m^2. (i) a random sample of 120 squares is observed and the number of snails in each square...
  22. J

    Probability, Correlation, Variance Statistics Homework Help.

    Homework Statement 1. Assume each birth in a hospital on a given day is independent of one another, and each birth, P(boy)=0.48. What is the probability that the 8th baby born is the 5th girl. 2. Two random variables X and Y have joint distribution given by. What is their correlation. 3. Z...
  23. LotusTK

    Homework Question - Beta and Alpha decay

    Hi, i am new here. Thought it would be good to sign up as i have just started hitting the books in preparation for my AS Level exams. So this is my first question. I think i may have done this question correctly, but i was just seeing what other people think as i am not 100% sure about it...
  24. G

    Multivariable Calculus Homework

    Homework Statement See in picture Homework Equations What is the final answer? The Attempt at a Solution I know dw/du = df/dx * dx/du + df/dy * dy/du & that dx/du = -8sinu & dy/du = -4sinvsinu Stumped on how to get df/dx and df/dy
  25. strangerep

    What do University lecturers think of the PF homework forums?

    What do University lecturers think of the PF "homework" forums? I've recently begun to realize how easily the homework forums are corrupted by students doing take-home assignments that contribute to their grade (and are supposed to be non-collaborative). Clearly, I'm rather naive in this, and...
  26. V

    Force and acceleration (not actually homework)

    Homework Statement This is more of a conceptual problem than a mathematical one (Note that this is purely for conceptual purposes of my own and probably doesn't really hold any practical value). I was just curious to know that if we imagine a book of mass m1 resting on any flat surface on...
  27. L

    Where Do Rayleigh-Ritz Trial Functions for Laguerre Equation Come From?

    Homework Statement I need to figure out the trial function for the Laguerre equation, xy''+(1-x)y'+ny=0 Homework Equations The Attempt at a Solution I have found multiple examples of the Rayleigh Ritz method on google, however, I am completely dumbfounded as to where the trial functions are...
  28. N

    Mass-spring system (not exactly homework)

    Case of a spring with a mass,m, that has been stretch beyond the equilibrium in the positive x direction. mg + (-kx0) = 0 k = mg/x0 stretch: F = mg+ [-k(x0+x1)] = mg-kx0-kx1 but since mg-kx0 = 0 F = 0-kx1 = ma ma = -kx1 a = -kx1/m How do I arrive at the corollary from a = -...
  29. G

    BJT Homework Help: Troubleshooting Results

    This is the result from a lab,but I am not sure the results are correct. Also,when I try to find I(c) , I(b) and I(e),by measured V(RC) and V(RE),I find the results strange. I guess the combination of R1=10k and R2=10k is under linear region,but the dc gain is so small. For combination of...
  30. D

    Struggling with Homework? Here's Your Solution!

    Homework Statement It's attached. Homework Equations The Attempt at a Solution I'm stuck on part b. I've attached my attempt at a solution not sure if it's right and, if it is, where to go from there.
  31. C

    Attached: Solving Homework Equations

    Homework Statement Attached Homework Equations Attached The Attempt at a Solution Attached. Couple of questions/confirmations: it should be vbcos(45)i - vbsin(45)j, but this is the same thing as cos(45)=sin(45) vb should be directed at B How do you solve equations 1 and 2...
  32. caters

    Curiosity about infinity in geometry(Not homework just curious)

    Okay, let's say you have an infinitely long line segment. Using area and volume formulas for different shapes, would you get an infinitely large shape that the formula was for in the first place? Area: For rectangles, would you get an infinitely large rectangle with A = l * w? What about...
  33. R

    Vertical Motion Homework Problem

    Homework Statement A rock is thrown vertically upward from the edge of a cliff. The rock reaches a maximum height of 18.6 m above the top of the cliff before falling to the base of the cliff, landing 6.60 s after it was thrown. How high is the cliff? Assume gravity= 9.8m/s2Homework Equations...
  34. B

    How Do I Calculate Y-Velocity and Launch Velocity from Projectile Motion Data?

    Hello Guys, This is my first post here. I need help on my homework that I have been working on all evening. Basically I am given video data. 10 trials of a plastic ball in projectile motion. I have to use Logger Pro. Four things I need to find out for each trial: x-velocity y-velocity...
  35. S

    Python Having some trouble with a little bit of Python Homework:

    Homework Statement The problem shows as follows: An arithmetic progression is a sequence of numbers in which the distance (or difference) between any two successive numbers if the same. This in the sequence 1, 3, 5, 7, ... , the distance is 2 while in the sequence 6, 12, 18, 24, ... , the...
  36. JasonHathaway

    Equivalent resistance between two nodes homework

    Homework Statement Determine the equivalent resistance Req as seen by the voltage source VS (the resistance between a and b) http://i.imgur.com/A1ueQnd.jpg Homework Equations Series-Parallel combinations The Attempt at a Solution http://i.imgur.com/K1ItpF0.jpg The only...
  37. P

    What is the determinant of a 3x3 matrix?

    Homework Statement Determinant |a b c| |d e f| = 5 |g h i| What is the determinant of? |4a 4b 4c| |3d 3e 3f| | g h i| The Attempt at a Solution So far I got this, a(ei - hf) - b(di - gf) + c(dh - ge) = 5 How would I even go about this, I have 9 unknowns, but only 1 equations?
  38. gcombina

    Which Equation Requires Radians to Be Valid?

    Which equation is valid only when the angular measure is expressed in radians? A. α = Δω/Δt B. ω= ΔΘ C. ω^2 = ωø^2 + 2αθ D. ω = Vt/r E. θ=1/2αT+ωøT
  39. J

    Household currents physics homework

    Homework Statement Typical household currents are on the order of a few amperes. If a 1.60A current flows through the leads of an electrical appliance, how many coulombs pass through it in 6.50min ? Homework Equations I=ΔQ/Δt The Attempt at a Solution 6.50min=1min/60s= 0.108s...
  40. R

    Thermodynamics/Fluids Homework Problem

    Hello, the problem statement reads thus: "Consider a low-speed flow of air over an airplane wing at standard sea level conditions; the free-stream velocity far ahead of the wind [point 1] is 100 mi/h [44.7m/s]. The flow accelerates over the wing reaching a maximum velocity of 150 mi/h [67.1...
  41. Y

    What Altitude Should a Geosynchronous Satellite Orbit Mars?

    Homework Statement In the not-too-distant future astronauts will travel to Mars to carry out scientific explorations. As part of their mission, it is likely that a "geosynchronous" satelite will be placed above a given point on the Martian equator to facilitate communcations. At what altitude...
  42. C

    Sets and functions, theoretical calc homework?

    Homework Statement Let A,B, and C be subsets of universal set U. Prove the following A. If U=A union B and intersection of A and B is not an empty set, then A= U\B B. A\(B intersection C) = (A\B) union (A\C) Homework Equations no relevant equations required The Attempt at a...
  43. X

    Homework help question: 2x-1/1-2x = -1 why?

    Why does 2x-1/1-2x equal negative one?Can someone explain this to me because i don't get it.
  44. R

    Real Rate 4%, Inflation 7%: Calculate Nominal Interest Rate

    What would you expect the nominal rate of interest be if the real rate is 4% and the expected inflation rate is 7%? I did n=4 I=7 (1+.04)= (1+.07)+(1+r) 1.04/1.07 - 1 = -2.80. Is that correct?
  45. Sneakatone

    Calculating Coulomb Forces Between Point Charges

    Homework Statement A point charge q1 = -3.9 μC is located at the origin of a co-ordinate system. Another point charge q2 = 7.3 μC is located along the x-axis at a distance x2 = 7.8 cm from q1. 1) What is F12,x, the value of the x-component of the force that q1 exerts on q2?Homework Equations...
  46. M

    Share price probability homework

    Hi, I'm trying to answer the following question: In each time period, a certain stock either goes down 1 with probability 0.39, remains the same with probability 0.20, or goes up 1 with probability 0.41. Assuming that the changes in successive time periods are independent, approximate the...
  47. Z

    Tension on a rope - not a homework question

    My boat is tethered to a rope that can withstand a maximum of 8000 pounds of tension. The wind will exert, at maximum, 3000 pounds of force on the boat. How do I calculate the tension on the rope based on the angles that the rope is at? does it make a difference if the boat is stationary, or if...
  48. S

    Question (not so much homework)

    [b]1. Homework Statement A square garden has an area of 1764 squared feet, and the gardener wants to install a sprinkler (with a circular spraying pattern) at the center of the garden. What is the minimum radius of spray the sprinkler would need in order to water ALL of the garden. [b]2...
  49. I

    Why Kinematics is So Popular in the Homework Forum

    Everytime I go into the homework questions forum and look at threads started by people it always makes me laugh what threads have so many comments. In the introductory physics forum when it's a question on kinematics, there's always like 10 people that answer. As soon as there's something about...
  50. S

    Is this a misprint in my SR homework?

    Homework Statement "In frame of reference S, an electron moving along the x-axis has energy 3mc2 and momentum magnitude √(8)mc Use the transformations of energy and momentum to find the energy and momentum magnitude observed in frame S′ moving with speed 4c/5 relative to S in the positive...
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