What is Homework: Definition and 999 Discussions

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

    2 Dimensional Tension Force Homework Help

    Homework Statement A sign is suspended from two strings as shown. Determine the wheight of the sign. Left string: Fτ=25 Newtons; ∅=40 degrees Right String:Fτ=25 Newtons; ∅=40 degrees Homework Equations i no that the mass is at equilibrium, so the tension forces are equal and opposite...
  2. X

    Right angle trigonometry homework question

    Homework Statement A steel plate has the form of one-fourth of a circle with a radius of 60 centimeters. Two two-centimeter holes are to be drilled in the plate positioned as shown in the figure. Find the coordinates of the center of each hole.Homework Equations I know it's got to be a simple...
  3. K

    Solving for g: A Homework Equation Mystery?

    Homework Statement If the period of a 70.8-cm-long simple pendulum is 1.91 s, what is the value of g at the location of the pendulum? Homework Equations I don't know of any that relate the period, radius and the value of g The Attempt at a Solution The thing is, I'm completely...
  4. V

    Homework AnswerCalculating Force & Distance of Two Masses

    A moon is orbiting around the planet with a constant distance of 4.0 x 10^8 with... Homework Statement Question/w formulas are in attachment. I know I've been given two masses, 5.5 and 7.35 x 10^ 22 kg, and a distance of 4.0 x 10^8. But what I don't understand is the speed of 950 m/s and...
  5. A

    Integration by Parts homework assistance

    Homework Statement ∫x3e5x2 dx Homework Equations uv-∫vdv The Attempt at a Solution I've tried this one a few times, but keep getting answers that are just out there. Could someone, if possible, work out just the beginning.
  6. T

    Static Equilibrium homework

    Homework Statement A painter (mass 61 kg) is walking along a trestle, consisting of a uniform plank (mass 20.0 kg, length 6.00 m) balanced on two sawhorses. Each sawhorse is placed 1.40 m from an end of the plank. A paint bucket (mass 4.0 kg, diameter 28 cm) is placed as close as possible to...
  7. A

    What Determines the Maximum Height for Water Flow in a Faucet?

    The main water enters a house on the first floor. the line has a gauge pressure of 1.9x10^5Pa a) A faucet on the second floor 6.50 meters above the first floor is turned off. what is the gauge pressure of this faucet? b)how high could a faucet be before no water would flow from it even if the...
  8. A

    Abstract Algebra homework Direct products

    Homework Statement We've shown if G_{1},G_{2},...,G_{n} are subgroups of G s.t. 1)G_{1},G_{2},...,G_{n} are all normal 2)Every element of G can be written as g_{1}g_{2}...g_{n} with g_{i}\inG 3)For 1\leqi\leqn, G_{i}\capG_{1},G_{2},...,G_{i-1}=e then G\congG_{1}xG_{2}x...xG_{n}...
  9. P

    Force Between Masses: Solving Physics Homework Questions

    Homework Statement --F-->{3.9kg}{5.8kg}{8.3kg} Three blocks are in contact with each other on a frictionless horizontal surface. A 413 N horizontal force is applied to the block with mass of 3.9 kg as shown in the figure below. The acceleration of gravity is 9.8 m/s2 . d)What...
  10. O

    Thermodynamic homework problem

    Homework Statement The question c) I have attached. Capture th.PNG (27.7 KB) Capture th2.PNG (14.8 KB) Homework Equations The Attempt at a Solution Use U=f(T,V) and H=f(T,P), then get Cp and Cv, so I can get gamma. then k=(1/v)(dv/dt) but I still can't prove it.
  11. alane1994

    MHB Help Me Find the Upper Limit of My Homework Question

    Here is my homework question. I am stuck on one part of it, and it is ok for me to receive guidance, not answers without effort. Question: Let R be the region bounded by the following curves. Use the shell method to find the volume of the solid generated when R is revolved about the x-axis...
  12. B

    Solving a Complex Homework Problem: Tip or Slide?

    Homework Statement I have been trying this question since 5 hours but I am lost ! Any help would be appreciated Some moron kids are trying to tip over a storage bin as shown. The bin weighs 7100 N, w = 2.2 m, h = 3 m, d = 1.6 m, and theta = 20 degrees. With what force do they need to push in...
  13. W

    Solving a Homework Assignment: Airplane Flight in a Windy Day

    Homework Statement an airplane, whose air speed is 580km/h, is supposed to fly in a straight path 38N of E. But a steady 72km/h wind is blowing from the north. In what direction should the plane head? i know the answer is 43.6 N of E but i am not completely sure how to get it Homework...
  14. M

    Homework question involving 2nd FTC, derivative of an integral

    Homework Statement Suppose that the function f : R → R is differentiable. Define the function H: R → R by H(x) = ∫−x to x of [ f (t) + f (−t)]dt for all x in R. Find H'' (x). Homework Equations The Attempt at a Solution i divided it up into ∫ 0 to x of [ f (t) + f (−t)]dt and -∫...
  15. S

    Need help for last problem in homework

    I was able to solve all my other problems for homework but I'm having problems with this one. Any help would be appreciated. Thanks A 1200 kg frictionless roller coaster starts from rest at a height of 19 m. What is its kinetic energy when it goes over a hill that is 11 m high?
  16. D

    Torques(Equilibrium of Solid Objects) Homework Problem - James Bond

    Homework Statement James Bond and Dr. No are engaged in fisticuffs on a board overhanging a pool. Dr. No now pulls out his weapon. oh no!. Bond is in trouble again. Bond quickly calculates the torques and leaps off the left end of the board leaving Dr. No on the right. Is Bond safe? That is...
  17. M

    Statics of Particle homework help

    Homework Statement In the following diagram (see attachment), w=80N and the net force is 0. The Attempt at a Solution I basically made two free body diagrams and applied Net Force = 0 for each axis, obtaining 4 equations with 4 variables (T1,T2,T3,T4). I got T1=56N T2=98N T3=115N...
  18. H

    Question about homework manipulation

    I'm taking mechanics and my professor said that the upcoming test will be very similar to the homework problems assigned. But he said we should know how to work the problems backwards. So in the homework he gives us a and b and we have to solve for c and he's saying that on the test he will...
  19. M

    How Can You Alter the Voltage Across a Buzzer to Interrupt a 'Safe Circuit'?

    Homework Statement I actually have posted this question in another part of this forum, but due to lack of responses, I felt maybe I posted it in the wrong section. Can you all take a looksie please? https://www.physicsforums.com/showthread.php?t=645676
  20. M

    Acceleration Practice Problems: Solving for Distance and Magnitude

    I have no clue where to begin with these assignments, can anyone walk through the steps to these? 1. An automobile accelerates from rest at 1.7 m/s2 for 22 s. The speed is then held constant for 29 s, after which there is an ac- celeration of −5.8 m/s2 until the automobile stops. What...
  21. E

    Capacitance and electric field homework

    Homework Statement ions and electrons produced in the electric field between the hand and the plate (3.0 x 10^6 Vm^-1) are accelerated and may collide with other particles, causing further ionisation. Calculate the force on an electron in this field. Homework Equations E=V/d The Attempt at...
  22. J

    E-field between two concentric cylinders (not homework)

    Hi, I have a question. Suppose you have two concentric cylinders of radii a and b with opposite uniform surface charges, line charges or something to that effect. Now, I know (or was told) that the E-field between the two, that is for a<r<b, is equal to the field from the inner cylinder (radius...
  23. Z

    How Do You Solve Challenging Homework Problem #3?

    Homework Statement Number 3 in the attached file Homework Equations Not sure The Attempt at a Solution Been staring at it for about an hour now and still don't have a clue. Can someone point me in the right direction? Thanks.
  24. P

    Need help on an object acceleration homework problem

    Homework Statement Someone throws an object upwards at 5 m/s from a window twelve feet high. A) what is the velocity of the pen at 1 second after it was thrown? Homework Equations D = vi * t + (at^2)/2 Vf^2 = vi^2 + 2adThe Attempt at a Solution I keep getting 4.8, but the answer is 1.2m/s...
  25. S

    I with this homework problem

    Homework Statement Find three positive numbers whose sum is 12 and the sum of whose squares is as small as possible. Homework Equations The Attempt at a Solution I don;t even know how to start this one, this is a section from partial derivatives on the max and mins. Please i need guidance...
  26. W

    Number Theory, with a proof discussed in class (not homework)

    Prove that ordda | ordma, when d|m. Some conditions are 1 ≤ d, 1 ≤ m, and gcd(a,d)=1. What I have so far: let x=ordma, which gives us ax\equiv 1 (mod m) \Rightarrow ax=mk+1 for some k\inZ Let m=m'd. Then ax=mk+1=d(m'k)+1
  27. L

    Homework Help: Calculating Moment of Inertia & Radius of Gyration

    Homework Statement Homework Equations radius of gyration: r = root (I/m) I = moment of inertia m = mass parallel axis theorem given above The Attempt at a Solution Okay, so I think the moment about CM is just m*0.24^2, but after that, I'm less sure. Is the moment about the hip just...
  28. M

    How High Does Henry Bounce on the Trampoline?

    The question is: Henry is bouncing on a trampoline, using the given data below, calculate the height at which Henry will bounce to from his lowest position. Lowest position: -0.50m Henry's Mass: 75kg upward acceleration: 13.3 m/s^2 upward force: 1750N downward force: 750N Net force...
  29. K

    Homework help: Transfer Function and Half Power Frequency

    Homework Statement I made a quick drawing of the circuit, and I apologize because I am not good at using the computer to draw circuits! Anyway, in this particular circuit R=200Ω , and L=5mH. For part a I am supposed to find the Transfer Function H(jw) = (Vout/Vin) in terms of ω. For part b...
  30. O

    Formation of the Solar System (Astrophysics Homework Help)

    Homework Statement Formation of the Solar System The distance of Venus is about 0.7 AU, and the orbital radius of Jupiter is about 5.2 AUs. How many times hotter is the region where Venus formed compared to the region where Jupiter formed? Enter numbers and decimal point only. Round off...
  31. D

    Calculating the Speedbump Radius to Stop a Car: A Homework Challenge

    Homework Statement A car goes over a speedbump, which has the cross-section of a cylinder of radius R embedded in the roadway. If you want a car driving with a speed Vo to be impeded, how large must R be? I'm very confused about this problem because we have not discussed the topic in class...
  32. L

    Homework question about radio waves

    "At what minimal height must be situated the point of reflection of a radio wave emitted in Montreal and received in Paris? The distance which separates both cities is 5 400 km and the radius of the Earth is 6 400 km." I don't even know where to start, we didn't learn this. I would assume the...
  33. D

    What is the displacement and component analysis of a cat climbing a tree?

    Homework Statement A subway train starting from rest leaves a station with a constant acceleration. At the end of 6.27 s, it is moving at 10.4082 m/s. What is the train’s displacement in the first 4.59591 s of motion? Answer in units of m
  34. D

    Calculating Frictional Force on a Moving Car on a Slope

    Homework Statement A 2,254-kg car is moving down a road with a slope of 10 degrees while speeding up at a rate of 1.1 m/s^2. What is the direction and magnitude of the frictional force? (define positive in the forward direction, i.e., down the slope)? Homework Equations ax=μgcos-gsin...
  35. U

    Edexcel Physics Statics Homework

    1. A uniform metal tube of length 5.0 m and mass 9.0 kg is suspended horizontally by two vertical wires attached at 50 cm and 150 cm respectively from the ends of the tube. Find the tension in each wire. Okay, so I've sketched a diagram out and labelled it. The support would be somewhere...
  36. L

    How to Minimize Error in Elliptical Orbit Model using Linear Algebra

    Linear Algebra Homework help! Homework Statement Suppose a particular object is modeled as moving in an elliptical orbit centered at the origin. Its nominal trajectory is described in rectangular coordinates (r;s) by the constraint equation x1r^2 +x2s^2 +x3rs = 1, where x1; x2; and x3 are...
  37. Y

    Help in Laplace Transform, not homework

    I am trying to do laplace transform of y(t)=e^{-at}\cos (bt)\;. The answer should be: \frac {s+a}{(s+a)^2+b^2} But here is my work, I can't get rid of the -ve sign. I must be too blind to see the obvious, please help: \overline{y(s)}=\int^∞_0 e^{-(s+a)t}\cos (bt) dt\;=\; \frac 1 b...
  38. S

    Solving a 5kg Object's Frictionless Pipe Homework

    Homework Statement A 5-kg object initially slides with speed V0 in a hollow frictionless pipe. The end of the pipe contains two springs, one nested inside the other, as shown above. The object makes contact with the inner spring at point A, moves 0.1 meter to make contact with the outer spring...
  39. J

    Universal Gravitation homework

    Homework Statement A student proposes to study the gravitational force by suspending 2 100 kg sperical objects at the lower ends of cables from the ceiling of a tall cathedral and measuring the deflection of the cables from the vertical. The 45 m long cables are attatched to the ceiling 1m...
  40. E

    Finding the Coefficient for No Movement: Homework Solution

    Homework Statement So basically this is a two part question, first part was find acceleration of the system (which i already found) with a coefficient of friction of 0.1. B) asks you what coefficient you need for the object not to move? Homework Equations The Attempt at a...
  41. Darth Frodo

    What are the solutions to the inequality?

    Homework Statement \frac{3x + 1}{2x - 6} < 3 Homework Equations The Attempt at a Solution \frac{3x + 1}{2(x -3} < 3 \frac{3x +1}{x - 3} < 6 Assume x < 3 3x + 1 > 6(x - 3) 3x + 1 > 6x - 18 3x + 1 - 6x + 18 > 0 19 > 3x x < 19/3 No Contradiction. Assume x > 3...
  42. vela

    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...
  43. J

    Solving Your Homework Problems: Using Equations to Calculate Pressure

    Homework Statement Is there an equation which I can use to calculate this? Homework Equations The Attempt at a Solution I think the SI units for pressure are kgm^-1s^-2 but that's all I know. I have tried to put numbers into that to get an answer but I can't get it to work. Thanks.
  44. C

    Solving Homework Equations: Taylor Series & Beyond

    Homework Statement Homework Equations All should be there, except taylor series, which is found here: http://mathworld.wolfram.com/TaylorSeries.html The Attempt at a Solution For part a, I got: F(r)= \alpha(ke2)((-r0/r2)+(r0n/rn+1)) since force is the negative...
  45. C

    True Story Can you do my homework

    True Story "Can you do my homework" Many years ago when I was studying at University I shared lodgings with several other students. The landlords teenage son was always pestering us to help with his physics homework. One day he had a problem that required a long descriptive answer. To get rid...
  46. N

    I need some guidance on my coulomb's law homework.

    Homework Statement two charged particles held fixed in the xy plane are: q1= +3.0 μC, x1=3.5 cm, y1= 0.50 cm, and q2= -4.0 μC, x2= -2.0 cm, y2= 1.5 cm. (question 1) What is the magnitude and the direction of the electrostatic force on q2. ? (question 2) Where would a third charge q3= +4...
  47. S

    Help with physics homework regarding friction, tension, springs and centrifugal force

    Homework Statement The first problem I am having trouble with is as follows: A child pushes a 40kg sled across the ice at a constant speed. If μk = 0.05 calculate the force applied to the sled. Homework Equations I know that f=\muFN The Attempt at a Solution I know that the...
  48. 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...
  49. 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}...
  50. 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...
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