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

    Homework question needed because physics teacher doesnt want to help me

    Homework Statement An electron travels 1.68 m in 6.74 × 10−8 s. How fast is it traveling? Answer in units of m/sHomework Equations The Attempt at a Solution (1.68)/ (6.74 x 10 ^ -8) = 24925816.02 i asked the teacher on this education facebook thingy for our school called edmodo if i was...
  2. B

    What are some sets that satisfy A∩P(A)ε B?

    Homework Statement The problem wants me to give an example of two sets that satisfy this condition A∩P(A)ε B Homework Equations None The Attempt at a Solution For my example I used this example A={1,2}...
  3. 1

    A couple of probability homework questions

    Homework Statement The first one seems too easy and I'm not sure I did it right (it looks like they are nearly asking what they gave in different words.) I'm relatively comfortable about what I did in the second, note that we did not cover probabilities of intersections of sets yet so I...
  4. G

    How Can Understanding Displacement vs. Distance Help Solve Physics Problems?

    I've tried several problems similar to these where I could get the answer checked without locking me out of my homework attempts, but I'm not really understanding what to do at all here - any and all help would be appreciated. An airplane flies 200 km due west from city A to city B and...
  5. micromass

    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...
  6. K

    How Do You Prove Point Equidistance and Find Loci in Geometry?

    1. A point P(x,y) is given equidistant from the points A(a+b,b-a) and B(a-b,a+b), then prove that bx = ay also find the locus of the variable point Z(a cos (theta), b sin (theta)), where (theta) is a variable quantity. 2. T0 prove that ax = by 3. In an attempt towards...
  7. Z

    A. P. French homework 1-2(a) Force exerted on satellite by Sun's radiation

    Homework Statement The intensity of the Sun's radiation just outside the Earth's atmosphere is approximately 8 \cdot 10^4 \frac {joules}{m^2 \cdot min} . Echo II is a spherical shell of radius r_0 = 20.4m. Its skin consists of a layer of Mylar plastic ... between two layers of aluminum. ...
  8. D

    What is the value of Ts in seconds?

    Homework Statement Ts (subscript s) = 2∏*√(4.5*10^-2 kg / 2.0*10^3 kg/s^2) kg = Kilograms s = seconds Ts = ? Homework Equations I do not have any relevant questions. The Attempt at a Solution Ts = 2∏*√(4.5*10^-2 kg)/√(2.0*10^3 kg/s^2) Simplified Ts = 6.28*[(0.212 kg)/√(44.72...
  9. G

    What is the Eigenspace for a 2x2 matrix with eigenvalues -5 and 3?

    Homework Statement Find the Eigenspace of the following matrix: \begin{bmatrix} 1 & 3 \\ 4 & -3 \end {bmatrix} I'm skipping a few steps but the Eigenvalues are -5 and 3. Let's starts with -5. Skip a few more steps, I know I'm right, just trust me. We now have the following matrix...
  10. azizlwl

    Proving the Limit of a Function Using Epsilon-Delta Definition

    Homework Statement If f(x)=x2 prove that \lim_{x \to 2} f(x)= 4 Solution given: We must show that given any ε >0, find δ >0 such that |x2-4|<ε when 0<|x-2|<δ Choose δ≤1 so that <|x-2|<1 ----------------------------------------------- Confuse between the word 'find' and 'choose'.
  11. B

    Find Voltage Across 47-uF Capacitor: A Math Homework Problem

    Homework Statement referring to the attatchment. the current consists of two semi circles. the question asks me to find the voltage across a 47-uF capacitor when t = 2ms. Homework Equations v(t) = 1/C ∫ i(t)dt +v(t0) {I realize their has to be limits for the integrand,I just can't type...
  12. F

    Gravitational Potential Energy homework

    datum 1 --------- E1=K1+G1+S1 =0+8(9.81)(-3)(sin37)+0 =-141.69 datum 2 --------- E2=K2+G2+S2 =1/2(8)(v^2)+0+0 = 4v^2 Frictional Force: 0.15x9.81.8 = 11.772Newtons U1-2= -11.722x2 = -23.544J E1+U1-2=E2 -144.69-23.544=4v^2 -42.0585=v^2 Can't square root...
  13. R

    Is this an extremely easy question? Not homework.

    Hello my apologies if this goes against rules idk if this applies to rules but I was watching Neil deGrasse Tyson talk with Steven Colbert for an hour and a half and at one point he answered a question from the audience by saying that Einstein, being the genius he is created his own way of...
  14. B

    Effect of distance in collimated space. NOT for homework.

    Hi All, I apologize in advance for the elementary nature of my question, but I have made a genuine effort to understand what is going on using a couple of optics textbooks and remain confused. My background is not in optics but I definitely am just missing something basic. I have an optical...
  15. J

    Exploring the Limit of f(x)^n: A Homework Challenge

    Homework Statement Imagine a function: f(x) = x + sin(x)/K where K is pi cubed. Suppose f(x)^n means f(f(f(f(...f(x))))) n times. Find the value of lim n->infinity f(x)^n Homework Equations The Attempt at a Solution I have no idea on where to start. Can anyone give a hint...
  16. U

    Calorimetry Homework: Rate of Heat Gain Before Switch Off

    Homework Statement when a metal cylinder of mass 0.02kg and specific heat capacity 500J/kg/K is heated by an electric heater working at a constant power, the initial rate of rise of temperature is 3K/min. After a time the heater is switched off and the initial rate of fall of temperature is...
  17. L

    What do Engineers Read? Homework Assignment

    I've been given a school assignment that if I were to, hypothetically, gets a story published on an engineering success story, what publication would I choose and why? Although this is a pretend situation, my professor will take no hesitation to fail the assignment if I am unable to provide a...
  18. S

    Solving a Homework Statement: Finding Forces and Distances

    Homework Statement **Hope I don't get in trouble for posting a screenshot of this online homework question...** Homework Equations \SigmaFx = marad = \frac{mv^2}{r} \SigmaFy = mgThe Attempt at a Solution Simple equations allowed me to find r = 1.323m and θ = 41.41° \SigmaFx = Tuppersinθ +...
  19. M

    Assembly Language homework help

    Homework Statement I'm having hard time appreciating this topic since they're not discussed well and, as of now, I still don't have resources or sample programs. We're required to display Az By Cx . . . Yb Za including spaces using DOS debug. Homework Equations The Attempt at a Solution...
  20. A

    What is the maximum height reached by a ball released from a spring-loaded tray?

    Homework Statement A M=1.5kg horizontal, uniform tray is attached to a vertical ideal spring of force constant k=185 N/m and m=275g metal ball is in the tray. The spring is below the tray, so it can oscillate up and down. The tray is then pushed down 15cm below its equilibrium position and...
  21. J

    What Is the Acceleration of a Car After 10 Seconds from Rest?

    Homework Statement Ten seconds after starting from rest, a car with a mass of 1000kg is moving at 40m/s. The acceleration of the car is? Homework Equations F=ma or a=vf-vi/t The Attempt at a Solution I have m=1000kg t=10s d=40m/s I am not sure if d is 40m/s though or is the...
  22. P

    Homework help:Heat transfer coefficient of flow over a flat plate

    A 2-m x 3-m flat plate is suspended in a room, and is subjected to air flow parallel to its surfaces along its 3-m-long side. The free stream temperature and velocity of the air are 20oC and 7m/s. the total drag force acting on the plate is measured to be 0.86N. Determine the average heat...
  23. M

    Need help with my homework 45minutes left till i have to hand it in

    [URGENT] Need help with my homework! 45minutes left till i have to hand it in Homework Statement a) Bianca wants to make a solar cooker to take on her camping trip what type of mirror does she need? b) Bianca makes a mirror by putting silver foil on an old, cut-up beach ball. The ball...
  24. J

    Calculating Net Electric Flux through Submarine Hull: E&M Homework Question

    Homework Statement The following charges are located inside a submarine: 2.00 µC, -9.00 µC, 27.0 µC, and -54.0 µC. (a) Calculate the net electric flux through the hull of the submarine. Homework Equations Flux = q/e0 The Attempt at a Solution I found the net charge, which happens...
  25. A

    Help with a discrete math homework problem

    Homework Statement show that for positive r and s, with r<s, we always have: r<(r+s)/2<s and 2/[(1/r)+(1/s)]^2< 2rs< (r+s)^2 Homework Equations The Attempt at a Solution i have shown that r<s because r+r<s+r, 2r<s+r, r<(s+r)/2 and 2r< (2s+2r)/4 (r+s)^2= r^2+2rs+s^2...
  26. M

    Microeconomics homework question-proving that a good is normal

    Hey, I need help with the following question in microeconomics: A consumer lives in a world of two goods: computers and money. Let x be the number of computers,the consumer can buy. x\epsilon [0,1,2,3] The consumer has the following preference relation: If the consumer has money and no...
  27. X

    Strain Gauge Angle Homework question.

    [a]1. Homework Statement [/b] I thought it would be easier to post a picture since this way the drawing can be seen. I'm having a hard time deciding what angles to use with the relevant equations, see below. Homework Equations I know that: Ex' =...
  28. A

    How Do You Solve Complex Trigonometry Problems in Physics?

    Hi, have a physics test coming up on Tuesday, and I was wondering if you all would like to help me out with a couple questions! 1) A highway is to be built between two towns, one of which lies 70.0 km south and 72.0 km west of the other. (a) What is the shortest length of highway that...
  29. H

    Bending Moments in Simply Supported Beam

    Just wondered if someone was able to give the homework the once over as I am not feeling confident i have this right. 1. I have a simply supported beam 10metres in length, supported at 2 metres in from both ends. there is a 5Kn U.D.L along the entire length of the beam and downward forces of...
  30. F

    Physics 1 related rates homework question.

    A child loves to watch as you fill a transparent plastic bottle with shampoo. Every horizontal cross section of the bottle is circular, but the diameters of the circles have different values. You pour the brightly colored shampoo into the bottle at a constant rate of 17.0 cm3/s. At what rate...
  31. R

    Distribution in Algebra: Calculating 16(1+h)^2 - 16(1)^2/h

    Homework Statement This is a calc problem but it's the algebra part I'm having trouble with: The Attempt at a Solution [16(1+h)2 - 16(1)2]/h [16 + 32h + 16h2 - 162]/h = 16/h + 32 + 16h - 162 this is a calc problem so h approaches zero = 32 + 16h - 162 = 16(h +...
  32. E

    How Can I Solve These Calculus 2 Homework Problems?

    1) 1. y=x, y=sinx, x=-∏/4, x=∏/2 find the area between these limited curves. 2. ∫(upper function-(lower function) 3. ∫x-sinxdx(between x=-∏/4, x=0) + ∫sinx-xdx(between x=0,x=∏/2). Am I right? If it's okay,I don't have a problem in this integral. 2) 1. ∫sin(2x)/sin^2x(^=power)dx 2. I'm not...
  33. A

    What Is the Normal Force on a Rollercoaster Car at the Top of a Hill?

    Homework Statement A roller-coaster car has a mass of 1150 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 16 m, its speed is not changing. (a) At the top of the hill, what is the normal force (using the negative sign for the downward...
  34. L

    Is the Calculation of Uncertainty for f Correct?

    Homework Statement let a=360.9±0.1, let b=180.4±0.1, let c=212.5±0.13 and let d=211.7±0.16 whats f (including uncertainty) where f-1 = ((a/b)-1)/((c/d)-1) Homework Equations add the percentage uncertainties in quadrature if dividing two variables add the absolute uncertainties...
  35. K

    Ladder Operators for Harmonic Oscillator Excited States

    I have a homework problem which asks me to compute the second and third excited states of the harmonic oscillator. The function we must compute involves taking the ladder operator to the n-power. My question is this: because the ladder operator appears as so, -ip + mwx, and because I am using it...
  36. M

    Arithmetic/Divisibility homework problem

    Homework Statement Solve for n in the following equations: n-2\mid n^{2}-n+3 Homework Equations The Attempt at a Solution Should i use the euclidean division to solve it? Thank you before hand. Edit: When i used euclidean division i got n+1 and a remainder of 5 but i don't know how to get n.
  37. C

    (Re-Answered) Spacetime interval homework question?

    (This problem was previously asked but poorly answered. Here is a link to the previous locked thread. https://www.physicsforums.com/showthread.php?t=202855) 1. State the problem, all variables and given/known data The star Alpha goes supernova. Ten years later and 100 ly away, as measured by...
  38. 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...
  39. 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...
  40. R

    Solving for Electric Field at Wire Surface: Homework Exercise

    Homework Statement A uniformly charged wire or radius R1=0.02m runs down the axis of a cylinder of inner radius R2=0.06m. The potential difference between the wire and cylinder is 60 volts. Find the electric field at the surface of the wire. Homework Equations Electric flux=Q/\epsilon0...
  41. S

    What is the speed of the spaceship as measured by Joe?

    Homework Statement Moe measure the length of his spaceship as 350 m. Joe observes this spaceship as it flies by his position and measures that it took 0.700 s to pass through. What is the speed of the spaceship? l': the length of the spaceship as measured by MOE = 350m t: the time as...
  42. D

    Calculating Repulsive Force between Two Charges at Different Distances

    Homework Statement two equal charges repel one another with a f = 4.0x 10^-4N when they are 10cm apart. If they are moved until the separation is 5.0 cm, the repulsive force is... Homework Equations f= kq1q2/r^2 The Attempt at a Solution I already calculated and I just would like someone...
  43. M

    Homework Help Signals and Systems

    I was trying to solve out this problem for homework and I came to the answer of all of them being false because they all went to infinity...but I have a gut feeling that this is wrong.
  44. D

    Fluids rate of flow homework help

    Homework Statement Two cylindrical pipes both carry an ideal fluid (zero viscosity) in laminar flow. Pipe A has radius Ra = 2 and flow velocity Va = 8cm/s. Pipe B has radius Rb = 4cm and flow velocity Vb = 4cm/s. A) Calculate the cross section of pipe A and pipe B. B) Calculate the rate of...
  45. D

    Understanding Archimedes Principle: Observing Bubble Size in Rising Water Column

    Homework Statement It`s not to calculate, actually, I am just trying to understand this. I think it has to do with Archimedes Principle, but could anyone explain the following more clearer to me? "It`s observed that as bubbles rise in a deep column of water, the diameter of the bubbles...
  46. A

    Truss/equilibrium homework help

    Homework Statement A horizontal truss, symmetric around its center, of mass 15,000 kg and total length 22m, is placed on two posts as shown in the figure Find the downward force that it exerts on each post. Homework Equations The Attempt at a Solution do i just take the force...
  47. E

    Help Solving Trig Homework: Find cos(u+v)

    Homework Statement If Sin(u)=\frac{\sqrt{2}}{2} and cos(v)=\frac{4}{5} and 0≤ u ≤\frac{∏}{2} and \frac{3∏}{2}≤ v ≤ 2∏ find cos (u+v) The Attempt at a Solution cos(u)=\frac{\sqrt{2}}{2} and cos(v)=\frac{4}{5} Do I just add them together? I feel like I'm missing something, but maybe the...
  48. D

    Mech. engineering; Homework Help; Velocity&BrakeForce

    PROBLEM The problem models a theme park ride similar to the 'Tower of Terror' or Drop Tower (photo below) http://www.zamperla.com/uploads/product/big/Prodotti/tower-rides/flashtower_main.jpg The carriage mass is 1532kg and carries a maximum number of 8 riders with an average of 75kg per...
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