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. 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...
  2. Yousuf Ejazi

    Calculate the induced EMF for angle α

    I have a question in my book and it’s confusing me a bit. I tried to search online for similar solved problems but couldn’t succeed. So here it goes:Calculate the induced EMF in a conductor loop when the angle between \vec{A} ~ and~ \vec{B} ~is~ changed ~from ~{0 °}~ to ~{α °} in 1 second...
  3. A

    Finding the limits of integration and quadratic formula

    Homework Statement Please look at the photo! Homework Equations -x^2+4x=x^2-6x+5 The Attempt at a Solution I got 2x^2-10x+5 but it says it's wrong
  4. S

    Finding Wave Speed: A Boy Fishing on the Jetty

    Homework Statement A boy fishing on the jetty observes water waves coming in from the ocean. He sees 4 waves pass him by in 2 seconds, each with a wavelength of 0.5m The speed of the waves is? Homework Equations v=d/t The Attempt at a Solution 4 waves pass him in 2 seconds. 4waves x 0.5m...
  5. E

    Physics Homework Help of converting to years (astronomy q)

    A star is 3.7 x 104 ly (light-years) from the center of its galaxy and is moving in a circle around that center at a speed of 170 km/s. (a) How long does it take the star to make one revolution about the galactic center? (b) How many revolutions has the star completed since it was formed about...
  6. H

    What is the Magnetic Field and Flux at Point O?

    Homework Statement [/B] There is lead XY shaped as straight wire. Next to it, circular lead with radius 0.10 m. They are in the same plane. XY to center of circle, O is 0.20 m. Curent flowing through XY is 15.7 AHomework EquationsThe Attempt at a Solution 1) find magnetic field (B) at O[/B]...
  7. S

    Electromagnetism homework check

    Hello. I have an assignment to submit and I really want to get full marks/know where I went wrong If anyone has a tiny bit of free time would you mind please checking my homework? Even if you just check 1 page I will be so grateful. Thanks again https://imgur.com/a/rHVdjzn
  8. Pratik007789

    Homework Help: Find the Electric Flux Through a Hole In a Sphere

    Homework Statement [/B] An uncharged nonconductive hollow sphere of radius 10.0 cm surrounds a 20.0 µC charge located at the origin of a cartesian coordinate system. A drill with a radius of 1.00 mm is aligned along the z axis, and a hole is drilled in the sphere. Calculate the electric flux...
  9. E

    Need help with an angular momentum problem....

    Homework Statement I've spent at least 1.5 hours on this problem trying to figure out what i did wrong and I can't find anything. With an exam in two days plus another chapter to go through. Regardless, here are the problem(6) and answer, as well as my work. Hope you can read it, and the...
  10. physicsquestionboi

    Kinetic Friction Homework Help

    A steel washer is suspended inside an empty crate from a light string attached to the top of the crate. The crate slides down a long ramp that is inclined at an angle of 37 above the horizontal. The crate has mass 154 kg. You are sitting inside the crate; your mass is 61 kg. As the crate is...
  11. Tomi Kolawole

    Finding the Magnetic Field of a Point Charge Using Biot-Savart Law

    Homework Statement Homework Equations [/B]The Attempt at a Solution I soled for the integral of the magnetic field but i don't know what bounds to intergrate over and also i what is DS in this case? its a point charge so shouldn't bio savart have q(v*b) instead of i(ds*r)?[/B]
  12. Liam C

    How Do I Determine Force of Static Friction on a Rolling Car

    Homework Statement A 1450-kg car is towing a trailer of mass 454-kg. The force of air resistance on both vehicles is 7471N[backward]. If the acceleration of both vehicles is 0.225m/s^2[forward], what is the force of static friction on the wheels from the ground? Homework Equations Fnet = ma...
  13. R

    Homework check - Mohr's circle & Shear stress in I beam

    Homework Statement Mohrs circle question - https://imgur.com/SKeTUXN Shear stress in I beam question - https://imgur.com/34yTyCAHomework Equations Mohrs Circle - None Shear stress in I beam - I = d . b^3 / 12 tmax = (F / I . b) . (A1 . y1) + (A2 . y2)The Attempt at a Solution For the...
  14. O

    A Capacitor with initial charge

    Homework Statement A capacitor with initial charge q0 is discharged through a resistor. What multiple of the time constant τ gives the time the capacitor takes to lose (a) the first 1/8-th of its charge (b) 7/8-th of its charge? Homework EquationsThe Attempt at a Solution since ı know...
  15. B

    Studying How to make the move from textbook to homework?

    Hey, I am a physics major and a new semester is about to begin. I think my biggest problem study wise is that I would go over the lecture notes and sometimes the textbook too, yet always feel ill equipped to tackle the homework problems. Currently my strategy is to go over the text...
  16. Cocoleia

    DSB-SC Signal from Homework Statement

    Homework Statement I am giving the following signal: and asked to get the DSB-SC signal of this Homework Equations 3. The Attempt at a Solution [/B] So, I know a few things. My prof writes that I would have to multiply my original signal out and then take the Fourier transforms...
  17. Liam C

    Average Force Question Given Velocities [High School]

    Homework Statement Nikhil is probably eating his daily snack at this time. Old Man Miller comes back from the store and takes the 0.150kg sandwich from Nikhil as he begins to run away. Nikhil is running at 7.5m/s away from me when I hit him in the head with the sandwich that was moving at...
  18. Liam C

    Motion and Forces [High School]

    Homework Statement Mariana is volleying with Old Man Miller and returns one of his feeble tennis serves. He serves the ball such that it is moving at a speed of 35km/h [Forward] when she strikes the 0.060kg ball and sends it back over the net at a velocity of 55km/h[Backward]. a) If the ball...
  19. Manolisjam

    3 balls in a moving mechanics problem

    Homework Statement Consider 2 balls A,B on the same line . and they are connected to a third one G with a rope L. AG, AB. now the system monves in the effect of the mass of G and its projection to the line AB is in the middle. No friction. mass of A=mass of B=m and mass of G=2m .FInd the time...
  20. Manolisjam

    Classical Mechanics Problem with balls

    Homework Statement Consider 2 balls A,B on the same line . and they are connected to a third one G with a rope L. AG, AB. now the system monves in the effect of the mass of G and its projection to the line AB is in the middle. No friction. mass of A=mass of B=m and mass of G=2m .FInd the time...
  21. B

    [Homework] Identify Filter type

    Homework Statement Identify the type of filter (kinds of frequencies the circuit filters out) analytically 2. The attempt at a solution I believe the top filter to be an inverting low-pass filter, which passes lower frequencies and blocks higher frequency signals. I also think that the...
  22. T

    Modern Cosmology Dodelson Problem 6.12b (Inflation)

    Homework Statement Show that ##4\pi G(\dot \phi)^2=\epsilon a^2 H^2## Homework Equations Over dots mean derivative with respect to ##\eta##. $$\frac{1}{a}\frac{d}{d\eta}=\frac{d}{dt}$$ $$H=\frac{\dot a}{a^2}$$ $$\epsilon=\frac{-\dot H}{aH^2}$$ $$(\frac{\dot...
  23. Elizabeth Chick

    Homework Question about Statistical Mechanics

    Homework Statement Consider the system of two large, identical Einstein solids, each with oscillators, in thermal contact with each other. Suppose the total energy of the system is 2 units of the energy quanta, i.e., =2ℏ, (i) how many MACRO-states (e.g., one macro-state corresponds to one...
  24. dUDEonAfORUM

    Find transverse velocity given an equation of displacement

    Homework Statement A wave pulse on a string is given by D(x) = D[0][/SUB]/(x[2][/SUP]+a[2][/SUP]), where D0 is a constant with units of cm3 and a is a constant with units of meters. a. If the wave moves along the string at a velocity of v in cm/s, what is the transverse velocity of particles...
  25. J

    Sequental elastic and inelastic collisions

    Homework Statement A taxi car weighing 2000kg hits a stationary mini-van that has a mass of 2200kg. The taxi stops and the mini-van rolls and hits a stationary sports car with a mass of 1830kg. Their bumbers hit and they move together at 2.3m/s. What is the velocity of the taxi before the...
  26. J

    Question about concentric conductors

    Homework Statement Three insulated concentric spherical conductors, whose radii in ascending order of magnitude are ##a, b, c##, have charged ##e_1, e_2, e_3## respectively, find their potentials and show that if the inner most sphere is grounded, the potential of the outermost is diminished...
  27. T

    Modern Cosmology by Dodelson: Problem 6.12 a

    Homework Statement The general goal of the problem is to derive some useful identities involving the slow-roll parameters during inflation. For part a show that: $$\frac {d} {d\eta} (\frac {1} {aH})= \epsilon - 1$$ Homework Equations $$\epsilon \equiv \frac {d} {dt} (\frac {1} {H})= \frac...
  28. C

    Engineering Mechatronics: DC Motor Position Control

    Homework Statement Write down the equations of motion and develop the continuous-time system. Homework Equations See my word doc. or PNG's. The Attempt at a Solution See my word doc. or PNG's. I assumed that there was no friction as no information was given. I can easily get the transfer...
  29. T

    Calculating the force (Homework question)

    Hello users, Im a boy whos in high school and has physics as a school subject. I'm not the best in physics at all and next week I'm going to have a 3-chapter test about physics. The teacher gave us some practice material and I struggle with this question, anyone that could help me? 1. Homework...
  30. Cheesycheese213

    Quick question about the medieval period?

    I was just wondering if there was any proof that the medieval period had more conflicts like wars etc. but with less (peace) negotiation between parties than now? Thanks so much!
  31. Irfan Nafi

    Conceptual Equipotential Surfaces Problems

    Homework Statement True or False: 1.Equipotential surfaces intersect: 2.Electric field lines are found within equipotential surfaces: Homework Equations E=Vd The Attempt at a Solution 1. I think this is false since the same reasoning describes why electric field lines don't intersect 2. I'm...
  32. SaifTaher

    Why is F=ma? (Physics homework)

    I'm taking an AP physics course on the edx.org platform and I arrived today at the "Forces" Unit. One of the fundamental properties of force that it's equal to acceleration times mass, but I, as a curious stubborn nerd, always look for the "why's", so I thought to myself "why it's not equal to...
  33. Likith D

    The solution of a problem regarding center of mass

    A rod of mass M (=4m) and length L is placed over a smooth horizontal table. One end of rod is attached with a block of mass m through a light string as shown in the figure. The pulley is friction less and light. the acceleration of com of rod at the given instant is (g = acceleration due to...
  34. C

    B How do you calculate how much force is applied to a thrown bal

    I’m trying to calculate how hard someone throws a ball. I know that F=ma, but the only force acting on a ball is the force of gravity and so the equation simply cancels out.
  35. Abhimessi10

    What is the Number of Fringes in a YDSE with Given Parameters?

    Homework Statement Find number of fringes separated by 1 cm on a screen at a distance of 2mm from slits which are 0.2mm apart from each other.The wavelength of light used is 500nm. Homework Equations The Attempt at a Solution I really don't know any way to solve it.I have tried putting unit...
  36. N

    Height of the image of Jupiter created by the objective lens

    Homework Statement I have the following variables: f = .93 m f(e) (eyepiece) = .0082 m distance toJupiter pj = 588 E^9 diameter of Jupiter dj = 139822 E^3 Find the height of the image of Jupiter created by the objective lens of a telescope. Homework Equations M = -q/p q = f Where M is the...
  37. A

    Measuring Range Extension "homework"

    a) dimension the moving-coil movement so that it indicates full deflection at 25 V given Values: Voltage Source: U2Max = 25V; moving-coil movement: IM = 100µA; UM = 270mV Rv = ( U2Max - UM ) / IM = (25V - 270mV) / 100 µA = 247,3kΩ b) the internal resistance is increased by 20 %...
  38. V

    Show metric perturbation transformation

    Homework Statement Consider following transformation: Transformation: $$X^{\mu}\rightarrow \tilde{X^{\mu}}= X^{\mu}+\xi^{\mu}(\eta, \vec{x})$$ where ##\xi^0=T, \xi^i=L_i## Show transformation of metric perturbation ##B_i\rightarrow \tilde{B_i}=B_i+\partial_iT-\partial_{\eta}L_i## Homework...
  39. T

    Determining reaction of indeterminate beam structure

    Homework Statement Homework EquationsThe Attempt at a Solution [/B] As this is an indeterminate structure with degree of redundancy 2, I have released support B & C. I then draw the BMD M0 of the Primary structure as well as BMD m1 and m2 of unit load system acting on B & C as follow: I...
  40. M

    Isentropic Expansion Within a Steam Turbine System

    Homework Statement Steam is expanded from 90 bar, 412°C to 4.0 bar saturation in a high pressure turbine, after-which a certain percentage of the steam is bled off to a feed heater. The remaining steam is then expanded through a low pressure turbine to 1.0 bar and dryness fraction of 0.93. All...
  41. P

    MHB Probability Homework Question 2

    Suppose that X, Y are uncorrelated random variables which are each measurements of some unknown quantity $\mu$. Both random variables have $\mu_{X} = \mu_{Y} = \mu$, but $\sigma^2_{X} > \sigma^2_{Y}$. Determine the value of $\alpha$ in [0, 1] which will minimize the variance of the random...
  42. P

    MHB Exam P Question for my Probability Homework

    A machine consists of two components whose lifetimes have a joint density function: $f(x,y) = \left\{ \begin{array}{ll} \frac{1}{50} & \quad x \geq 0, y \geq 0, x+y \leq 10 \\ 0 & \quad Otherwise \end{array} \right.$ The machine operates until both...
  43. H

    What is the formula for calculating frame deflection in a beam problem?

    Homework Statement Homework Equations The answer in the book is (4F(L^3))/3EI The Attempt at a Solution I felt the above question could be simplified into a standard beam problem. I choose the following beam. I used the Yc equation, but when I replace a with L I get an answer of...
  44. ertagon2

    MHB Double-Checking Maths Homework for a 100% Semester Grade

    So here is a thing. If I get at least 6/10 questions in this homework I will get 100% in this semester's homework which is equivalent to 20% of the maths module. So could you double check these questions? Also I wouldn't mind some help with q.3 I got a weird answer of 11,8 billion. Workings...
  45. Y

    Find the force to push a book sideways on a table

    Homework Statement Place a book flat on a table and press down on it with your hand. Now suppose the hand-book and table- book values of are 0.50 and 0.40, respectively; the book's mass is 0.90 kg and your downward push on it is 10 N. How much horizontal force is needed to keep the book moving...
  46. Y

    Find minimum stopping distance

    Homework Statement A crate is being transported on a flatbed truck. The coefficient of static friction between the crate and the bed is 0.470. What is the minimum stopping distance if the truck, traveling at 70 km/h, is to decelerate uniformly and the crate is not to slide forward on the bed...
  47. Y

    Solve for the tension in a rope pulling a box

    Homework Statement A worker is going to attempt to pull a 90-kg box across a level floor by a rope that makes an angle of 35° with the floor. The tension in the rope is gradually increased until the box just starts to move. If the coefficient of kinetic friction is 0.36 and the coefficient of...
  48. Y

    Determine the elevator's acceleration

    Homework Statement An 82 kg man inside a 40-kg dumb-waiter pulls down on the rope. At that moment the scale on which he is standing reads 209 N. Determine the elevator's acceleration. Homework Equations F=ma The Attempt at a Solution I know the acceleration is 0.152 m/s^2 upwards , I need...
  49. D

    LaTeX Preamble for setting up a latex/pdf for homework or writing test.

    I use this when making exams for all my courses. It goes in the preable or the very beginning of the .tex file. Note the use of the commands, I also include commands imported by the file macros! Macros is simiply a .tex file defining your own commands. I have included in another post a list...
  50. Pushoam

    Is My Homework Solution Correct?

    Homework Statement Homework EquationsThe Attempt at a Solution ##C_p - C_v = p \frac{\partial V}{\partial T} ## Doing the above, I got ## R\{ 1+ \frac{bp} {RT^2}\}##, there is no square in the right factor. I want to know whether my answer is correct.
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