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. C

    Solving Homework: Understanding I/O Designation Charts

    Homework Statement Uploaded as image 1 I will show my workings for 2 if 1 are in the right direction I also don't understand what is meant as I/O Designation charts (nowhere in my study notes) Homework Equations None The Attempt at a Solution Uploaded as image 2 is my attempt.
  2. Jeviah

    Aerofoil Reynolds number, meaning of a statement in my homework

    Homework Statement hello, i have been given a piece of homework which is determining the characteristics on an aerofoils boundary layer. In the brief the following statement is made with no context “Aerofoil is flying in chord Reynolds number 0.2x10^6” am i correct in saying that is the point...
  3. J

    How Does Preloading Affect a Cantilever Beam's Structural Integrity?

    Hello, everyone.I have been trying to understand the meaning of the question from the posted image.I think that preloading has to do with adding bolts to the cantilever beam such that it can withstand the force from above, but I am not sure how exactly these bolts should be implemented.I would...
  4. F

    Solving a Homework Problem with One Pivot

    Homework Statement https://cdn.discordapp.com/attachments/373928512811302912/528638926148337704/question.PNG part a )50N I cannot answer part b. Homework Equations M=FD The Attempt at a Solution Ok so if both pivots were in contact with the beam I would just equate them with the oppposite...
  5. M

    Requesting help with centripetal acceleration homework

    Homework Statement A hockey puck of mass m = 80 g is attached to a string that passes through a hole in the center of a table, as shown in the figure below. The hockey puck moves in a circle of radius r = 1.10 m. Tied to the other end of the string, and hanging vertically beneath the table, is...
  6. Stitch1775

    Momentum and collisions homework help

    I need help, I've been staring at this problem for over an hour and trying to find similar problems online with no luck. A 65 kg person is skiing down a hill. The skier's speed at the bottom is 15 m/s. If the skier hits a snowdrift and stops in .30s A)how far does the skier go into the drift...
  7. cookiemnstr510510

    Solve Magnetic Field Homework: Find Velocity of Metal Strip

    Homework Statement A metal strip 6.5cm long, 0.88cm wide, and 0.76cm thick moves with constant velocity, magnitude v along positive y-axis, through a magnetic field, B=1.2mT along positive z-axis. A potential difference of 3.9x10^-6V is measured between points x1 and x2 (as shown in...
  8. S

    Dodelson Cosmology 6.8 Inflation Klein Gordon Equation

    Homework Statement Show that Eq. (6.33) follows from Eq. (6.32) by changing variables from t to ##\eta##. Homework Equations (6.32) $$\frac{d^2\phi^{(0)}}{dt^2}+3H\frac{d\phi^{(0)}}{dt}+V'=0$$ (6.33) $$\ddot{\phi^{(0)}}+2aH\dot{\phi}^{(0)}+a^2V'=0$$ The Attempt at a Solution So...
  9. S

    Homework help: Work and Energy, Free fall

    Homework Statement A 200 kg object moves at 10 m/s at 20m (vertically). It falls to a height of 5 m. Find the new speed. Homework Equations vf²=vi²+2ad The Attempt at a Solution vf²=(10m/s)²+2(9.8m/s²)(15m) vf=19.8m/s To find the distance for the new speed I did 20-5, but I'm not sure it's...
  10. S

    Homework help: Work and Energy: Spring

    Homework Statement A .5 kg loaded toy (spring k=8000 n/m) loaded toy is compressed .05 m and fired on a flat surface a) Find the new speed it was released with b) If it approaches a hill find the maximum height it can climbHomework Equations KE=1/2kx² KE=1/2mv² PE=1/2kx^2 The Attempt at a...
  11. F

    Homework - A galaxy in the local universe

    Homework Statement I have the following questions as homeworks and I would like to get help. Here's some informations given to help us to answer : Photometry : U=11.60 B=11.16 V=10.20 Redshift : z= 0.00780 Central velocity dispersion : ##\sigma_{v}## = 210 km/s Introduction : The...
  12. F

    Homework - Interparticle distance between galaxies

    Homework Statement [/B] I have the following questions as homeworks and I would like to get help. Question 1) Give the formal expression of the total number density of galaxies. Why is this expressoin problematic in practice? Question 2) In practice one uses a numerical value for the number...
  13. F

    Exploding Pumpkin: Solving for Third Fragment's Velocity, Direction, and Mass

    Homework Statement A pumpkin of mass 3.30kg at rest on a smooth frictionless plane, explodes into 3 pieces in the horizontal plane. A .50kg piece flies to the North at 3.2m/s. A 1.4kg piece flies off (SW) at 4.1m/s. What is the speed, direction and mass of the third piece? Homework Equations...
  14. M

    Can 3 forces of 9N, 4N, and 6N be in equilibrium?

    Homework Statement A mass of 3kg is acted upon by three forces of 4.0 N, 6.0N, and 9.0N and is in equilibrium. The 9N force is suddenly removed. Determine the acceleration of the mass. Homework Equations F=ma. The Attempt at a Solution My main problem with this question is that I cannot think...
  15. astroman707

    How to get better at theoretical homework problems

    I’m having lots of trouble in my honors physics class with the theoretical homework problems that are assigned. The entire concept of learning to solve things theoretically, and then applying it is brand new to me. I’m decent at figuring out the applied problems, but pure theory stumps me. I...
  16. T

    Day Night Effect of Neutrinos

    Homework Statement I'm trying to solve problem 3 from http://www.ictp-saifr.org/wp-content/uploads/2018/07/hw_ICTP-SAIFR-2.pdf The problem is as follows: Assume that solar neutrinos arrive at the surface of the Earth in the ##\left| \nu_2 \right>## state (a mass eigenstate). Assume this...
  17. T

    How is the horizon length related to the power law spectrum

    Homework Statement For a power spectrum density fluctuations ##P(k) \propto k^n##, I need to find the scaling (with respect to ##a##) of the horizon wavenumber ##\frac{2\pi}{\chi_H}## in a matter dominated universe in terms of ##n##. ##\chi_H(a)## is the evolving particle horizon, in a flat...
  18. Cheesycheese213

    How to find the square root of a square root?

    Homework Statement Simplify √(53 - 8√15) Homework Equations Numbers can be represented as √a - √b The Attempt at a Solution I had tried to make in an equation where the 2 expressions were equal, but after squaring both sides, I didn’t really know what to do. I had also tried to use something...
  19. A

    Solving the Homework Equations: What Am I Doing Wrong?

    Homework Statement [/B]Homework Equations 1/s+n/s′=1/f where s is distance from source to diffracting surface, s' is distance from diffracting surface to focus, f is the focal length, n is the refractive index. The Attempt at a Solution Since we have parallel beams, we have s = infinity so the...
  20. J

    Should I use time dilation or length contraction?

    1. Homework Statement [/B] This is a problem that was in my Physics HW. Two powerless rockets are on a collision course. The rockets are moving with speeds of 0.800c and 0.600c and are initially ## 2.52 × 10^{12} ## m apart as measured by Liz, an Earth observer, as shown in Figure P1.59. Both...
  21. D

    Physics homework help regarding energy and friction

    Homework Statement The maximum power output of a car of mass 500kg is 75kW. Up a hill of angle 11.534, its maximum (constant) speed achievable with this power is 30m/s. What is the energy dissipated by frictional forces every second, and what must the frictional force be? Homework Equations...
  22. sophia026

    Physics Homework -- block pressed against a wall is sliding....

    Hey! I've been trying to figure out these two problems but can't seem to get the right answer. Was wondering if someone could help me out? 1. A block is pressed against a vertical wall by a force F, as the drawing shows. This force can either push the block upward at a constant velocity or...
  23. Abhimessi10

    Motion of a charged particle in magnetic field

    Homework Statement A particle of charge -q and mass m enterd magnetic field B at A with speed v1 at an angle alpha and leaves the field at C with v2 at angle beta.Then, a)alpha=beta b)v1=v2 c)particle remains in the field for time t=(2m(pi-alpha))/qB d)All of these Please see image below...
  24. M

    Defining velocity as a function of distance

    Homework Statement The equation is given: v = f(t) = (mg/b)(1 - e^((-b/m)t)) Where v is velocity, m is mass, g is 9.81 and b is a constant of proportionality I need to find the function k(x), where x is distance from said body's initial position. 2. The attempt at a solution v = f(t) =...
  25. Lapse

    Engineering Question About A Particular Circuit in LTSpice

    I am simply attempting to design a circuit in LTSpice. We just started on dependent sources. I am having trouble designing this guy here: Here's what I've got: What does this error mean? What do I need to change to make this circuit work?
  26. I

    Electric Fields and Electric forces help

    Homework Statement This is the question Structure opposite comprises 5 ions each of which has lost one electron. The sides of the square formed by the 4 outer ions are of length 0.2nm Ion E is at the midpoint 1.What is the force on A due to ion A?Homework Equations I'd imagine: F= kq / r^2...
  27. C

    How Do You Solve Complex MOSFET Equations in Homework Problems?

    Homework Statement Homework EquationsThe Attempt at a Solution I think that up there is right so far since I didn't see any other relationship between the two MOSFETS other than their IDs are equal. But after I keep simplifying that equality, I end up with this I have no idea what to do...
  28. Abhimessi10

    Charge distribution on concentric spheres

    Homework Statement Two thin conducting spherical shells have radii R1 and R2.Outer shell is charged to q and inner shell earthed.Find charge appearing on both the shells. Homework Equations The Attempt at a Solution Isnt the charge on inner shell 0 and charge on outer shell remains Q as it...
  29. Qmechanic18

    Which block will strike first? Left or right?

    1. A block of Mass 'm' is connected to another block of Mass '2m' through a weightless pulley by a weightless inextensible thread of length 2l. The left block(mass=2m) rests on a table at a distance l from its edge, while the right block is kept at the same level so that the thread is...
  30. Qmechanic18

    Uncovering the Mysteries of Physics: Exploring the Purpose of Physics Forums

    Hello there, I am a new member looking to gain more knowledge on physics...
  31. Abhimessi10

    Combination of capacitors

    Homework Statement Between the plates of parallel plate condenser having charge Q,a plate of thickness t1 and dielectric constant k1 is placed.In the rest of the space,there is another plate of thickness t2 and dielectric constant K2.The potential difference across the condenser will be...
  32. KristinaMr

    Solving for Temp Change of Epoxy Frames for Lenses Insertion

    Homework Statement This is the problem. A pair of eyeglass frames is made of epoxy plastic. At room temperature (20.0°C), the frames have circular lens holes 2.20 cm in radius. To what temperature must the frames be heated if lenses 2.21 cm in radius are to be inserted in them? The average...
  33. Abhimessi10

    Charge entering into the field between capacitor plates

    Homework Statement A negative charge of mass m enters into the field between two deflecting parallel plates with length 'l' separated by distance 'd' with a velocity 'v'.Assuming electric field to be uniform,find the maximum charge so that it will not hit a plate Homework Equations Kinematic...
  34. YoungPhysicist

    A weird homework that requires everyone to answer

    Homework Statement If the following question is inappropriate,please tell me immediately,and I will delete it.[/B] I got a really weird math homework today:find out questions in math textbooks of other parts of the world look like,specifically,how many percent of: prove questions(questions...
  35. StillLearningToronto

    Calculating Quasar Variability Using CCD Camera and Magnitude Comparison

    Homework Statement You have decided to use a CCD camera to check if a 16th magnitude quasar is variable. With your telescope/camera combination, you know that a star with a magnitude of 0 would deliver 1 × 109 photons/second to one pixel, so this allows you to work out the photons/second from...
  36. Physicsterian

    Defining equilibrium and movement in pulley arrangements

    Homework Statement I had to answer which of the pulley arrangements illustrated (see picture) is in equilibrium (the drawing went a bit difficult, please see all outer boxes as equal in size and the middle ones as well) I managed to answer that it is arrangement C, by finding out that...
  37. yecko

    Solving Homework Equations: The Attempt at a Solution

    Homework Statement solution: Homework Equations The Attempt at a Solution I thought this question should use :, but the solution manual used instead, which 1/2 is missing... may I know what the 1/2 account for and why doesn't we need to multiply the equation by 1/2 ? thank you
  38. Jerry Z

    Homework help: Uncertainty with negative power

    Question: A distance R is measured to be 3.400 ± 0.007m. What is the absolute uncertainty in R^−2? Attempted solution: Relative uncertainty: 2* (0.007/3.4) = 4.11E-3; R^-2 = 3.4^-2 = 0.0865 m^-2; Absolute uncertainty = R^-2 * relative = 0.0865 * 4.11E-3 = 3E-4 m^-2; Any help would be greatly...
  39. Physicsterian

    Effect of density on downward rolling spheres

    Homework Statement If two balls, being identical in volume, but different in density (one ball is made of iron, the other of aluminum) roll down from an inclined plane, which will reach the bottom first and which will cover a larger distance after having reached the bottom? IMPORTANT NOTE...
  40. Physicsterian

    Defining which cyclist profits the most from slipstream

    Homework Statement - Question: Which cyclist (A, B or C) profits the most from cyclist slipstream (also called “aerodynamic drafting”)? - Given: the direction of the wind, the positions of each cyclist; an illustration representing this - NOTE that I am expected to solve this question...
  41. S

    Physics concepts behind pneumatic tube systems?

    I have a project for my physics class that revolves around the idea of building a working pneumatic tube system. I understand how I would build it and such but my teacher wants me to explain the theory behind it. Does anyone have any ideas about the physics behind this or the principles, rules...
  42. Jozefina Gramatikova

    Help with Homework: Part a) Proven, Part b) Checked, Part c?) Stumped

    Homework Statement Homework Equations The Attempt at a Solution I proved part a) Can you please check if part b) is correct? I don't know what to do in part c)
  43. A

    -- Calculate force at CG & away from CG

    Homework Statement Hello All, Please help me to find the force required to rotate a body of 4 Kg mass from 0° to 90° in 5 second. this force is acting at center of gravity. (Image: case 1) CASE-2: Force acting away from center of gravity. (Image: case 2) Homework EquationsThe Attempt at a...
  44. Edemardil

    Help with a few homework questions on force:

    Homework Statement 1) A moonshiner makes the error of filling a glass jar to the brim and capping it tightly. The moonshine expands more than the glass when it warms up, in such a way that the volume increases by 0.6% (that is, ΔV/V0 = 6 ✕ 10-3) relative to the space available. Calculate the...
  45. S

    Homework help: anisotropic elasticity equations

    Homework Statement Hello, I'm studying anisotropic elasticity. One of the books I'm using is Lekhnitskii's. The book presents the general equations of the theory of elasticity for an orthotropic body as follows: Homework Equations The Attempt at a Solution However, when I combine the...
  46. H

    How Do You Calculate Buckling Load and Failure Mode in Columns?

    Homework Statement i am completely lost with this question. i need to work out: a. what minimum length the column will buckle. b. what load the failure would occur. c. if column was half length what would be mode of failure and the load it would fail at. i would appreciate any help as i am...
  47. prakhargupta3301

    Having a problem in steps while solving integrals

    Homework Statement My problem is in integral calculus (I'm new to it). I know what it is and how it works (basically. I'm not too advanced right now). The problem is as following: (I will be posting comments/reasons along with what I've done and with what logic/understanding I've done it...
  48. V

    An object of some mass, m, is accelerated upwards....

    Homework Statement an object of some mass, m, is accelerated upwards (from rest) off the surface off the Earth for some unknown time, t. At the end of this time, the object is traveling at some new speed, x. Derive the following formula. That is, show that no matter how much time the rocket...
  49. F

    Solve Tension in Rope: 110 Kg Anvil & 9.81m/s^2 Force

    Homework Statement I have a rope held by a hook, which is attached to the ceiling by a chain (with an angle theta), in one side, the rope (with an angle alpha) is attached to a a wall, in the other side, the rope is carrying an anvil of 110 Kg mass in vertical position. What is the tension in...
  50. Poguer0170

    Calculating Potential Difference in a Parallel Plate Apparatus

    Homework Statement an electron with a speed of 5x10^6 m/s is injected into a parallel plate apparatus, in a vacuum, through a hole in the positive plate. The electron collides with the negative plate at 1x10^6 m/s. What is the potential difference between the plates? Homework Equations...
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