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. T

    Pressure caused by beam of molecular oxygen

    Homework Statement A beam of molecular oxygen containing 1010 molecules/cm3 and average speed of 500 m/s strikes (elastic collision) a plate at an angle of 30º with the normal direction. Calculate the exerted pressure on the plate. Homework Equations P = Impluse x Flux The Attempt at a...
  2. APphysicsSenior

    Acceleration of object with friction: Homework help

    A 50 kg box rests on the floor. The coefficients of static and kinetic friction are 0.70 and 0.50, respectively. a.) What is the minimum force required to start the box sliding from rest? b.) After the box starts sliding, the person continues to maintain that force. What is the...
  3. H

    Bio Lab homework: Water Parameter Identification Chart

    Homework Statement Fill-in with the correct tank letter or the condition (eg. PPM of O2) Refer to above Chart A: __1. Which tank contained the lowest PPM of Oxygen? __2. Which of the 4 abiotic conditions(02, C02, PH, or Temperature) is most out of line in tank...A-G? __3. Which tank has a...
  4. C

    Measuring the Speed of Sound: Examining the Frequency of Clicks

    Homework Statement This is a problem from the Cambridge Natural Science Admissions Assesment. A student carries out an experiment to measure the speed of sound. A loudspeaker that emits sound in all directions is placed between two buildings that are 128 m apart as shown. The student and...
  5. S

    Opinions on elementary school science homework

    Hi all. I'm reviewing my daughter's science homework and I disagree with how things are being presented. I wanted some feedback from everyone here to get a sanity check on my own thinking. The exercise is this: answer whether these properties of matter are either an observable property or a...
  6. M

    Not exactly a homework issue - just trying to find a formula

    Alright, first I should probably let you all know that this is very simple physics, so I'm just looking for a quick answer. 1. Homework Statement I'm trying to find a simple way to calculate the average velocity of an object where we know the average velocity during a number of segments of...
  7. patrickmoloney

    Molar latent heat of phosphine

    Homework Statement [/B] Phospine exist in three forms. known as the \alpha, \beta and \gamma forms. The \alpha and \beta forms are in equilibrium with each other at 49.43 \, K, and the \alpha and \gamma forms are in equilibrium at 30.29 \, K. Obtain the molar heat of transformation for the...
  8. F

    Finding the period of an object moving in horizontal circle

    Homework Statement A small mass m is suspended from a string of length L. The body revolves in a horizontal circle of radius R with a constant speed v. Find the speed of the body and the period of the revolution. Homework Equations ΣFx = Tx = mV^2/r Period = (2πr)/V The Attempt at a...
  9. P

    Falling object, time between images

    Homework Statement Estimate the time between each photoflash of the apple in Fig. 2-18 (or number of photoflashes per second). Assume the apple is about 10 cm in diameter. [Hint: Use two apple positions, but not the unclear ones at the top.] Homework Equations All we have learned in class is...
  10. D

    Minimum Speed for a Horizontally Projected Diver to Clear a Ledge

    Homework Statement A daring 510N swimmer dives off a cliff with a horizontal leap. What must his minimum speed be just as he leaves the top of the cliff so that he will miss the ledge at the bottom, which is 1.75m wide and 9.00m below the top of the cliff? Homework Equations s=1/2gt^2 ; v=s/t...
  11. A

    Finding the Formula for Speed and Distance on an Icy Hill

    Homework Statement Maxine (mass m) slides down an icy slope then along a flat surface before coming to a stop. The slope has angle θ and height h. a. Derive a formula for speed at the bottom of the hill in terms of the angle of the hill θ, the height from which she starts h, and the...
  12. fresh_42

    Insights 10 Math Tips to Save Time and Avoid Mistakes - Comments

    Greg Bernhardt submitted a new PF Insights post 10 Math Tips to Save Time and Avoid Mistakes Continue reading the Original PF Insights Post.
  13. R

    Venn Diagram Homework: Understanding the Basics for 3rd Graders

    Okay so I have a friend who has a 3rd grader and is 7 years old and he is having trouble completing this homework... we can't figure out how to do the problem on the 2nd page, we understand the example in the first page Page 1 Is the example page. I am going to attempt to translate to English...
  14. D

    Homework question using the chain rule -- oil slick spreading on the sea....

    <Moderator's note: Moved from a technical forum and thus no template.> Question: A certain amount of oil on the sea surface can be considered as circular form and the same thickness throughout its surface. At a certain time, the following are noted Data: Oil is supplied to the spot at 5m^3/min...
  15. E

    Energy Transformation Question

    1. The problem is: In point form, outline the process through which electricity is generated, highlighting the energy transformations that occur. Then state an advantage and disadvantage for this type of electricity production. The attempt at a solution I will be describing the energy...
  16. S

    What are some resources for high school students interested in physics?

    I am joining this forum to expand my knowledge on my favorite subject being physics. I may not be veyr active but if I have questions about homework or curiosity in general, I'll post here and hope for a response. Thanks
  17. Zer0

    Auto-Closing Gate (Relative Acceleration problem homework)

    1. Homework Statement It's an auto closing gate. Two parts of the gate are identical. I had given to find the time taken to close the gate. The distance to close point (P) of the gate from closed event of the gate is given as "a". Sorry for my bad English. What i need to know is how the two...
  18. H

    Finding the equations of state via the fundamental relation

    Homework Statement Homework Equations $$\frac{\partial S}{\partial u}\Bigr|_{v} = \frac{1}{T}$$ $$\frac{\partial S}{\partial v}\Bigr|_{u} = \frac{-P}{T}$$[/B] The Attempt at a Solution a.) $$\frac{S}{R} = \frac{UV}{N} - \frac{N^3}{UV}$$ $$\frac{S}{R} = \frac{UV}{N} - \frac{N}{uv}$$ $$...
  19. runningman19

    Adiabatic Compressor: Ideal Gas Temperature Change

    Homework Statement A mixture of hydrogen, carbon monoxide and carbon dioxide is being fed to a compressor at 2.0 bar and 25 C. The overall flow rate is 17.47 SCMS and its composition is 73.5 mol% H2, 13.7 mol% CO and the balance CO2 The compressor operates adiabatically and reversibly with a...
  20. A

    Significant Digits for Uncertainty Values

    Homework Statement Question on worksheet: What is the random uncertainty in this set of measurements? Use the instrumental uncertainty to limit the number of digits in your random uncertainty result. Data for dropping a pencil from a height of one meter using a stopwatch that measures to the...
  21. A

    Is math homework a mistake for pre-teen and teenage students?

    Most people don't get to cal 1 in high-school by the time they are seniors. People are excepted to get ready for cal 2 by the time they get to college. People don't get to cal 1 because they don't study at their home. However, in my personal opinion, is homework a mistake to give to students...
  22. M

    Homework Help Regarding Newton's Theory

    Hello all; this my first time ever taking physics, and I am in dire need of some help with homework. I've had an attempt at part A (please take a look and provide feedback), but have no clue where to even begin on part B (how would I go about calculating questions 5, 6, and 7, to be precise?)...
  23. F

    How to Linearize Data for Solar System Motion Analysis?

    Hi, I'm supposed to linearize this set of data: "Below is a data set which includes information about the motion of the objects in the solar system. Note: the periods are listed in Earth years (time it takes the Earth to complete one orbit around the Sun) and the average distances are reported...
  24. W

    Complex Plane Homework: Mobius Transformation Advice

    Homework Statement Homework EquationsThe Attempt at a Solution I'm not sure how to even begin this problem. My notes mentioned something about a Mobius Transformation but that's not something that I've been taught, and certainly not something I'm familiar with. Any advice would be greatly...
  25. aatari

    Analyzing Tensions in a Mass-Weight System

    Hi guys, could someone please have a look at my solution and let me know if it makes any sense. Homework Statement Homework Equations N/A The Attempt at a Solution [/B]
  26. B

    What is the potential for extremity doses in this X-ray exposure incident?

    Homework Statement A research worker is irradiating some drug samples in an x–ray beam. The tube is running at 60kVp with a tube current of 4mA. Although the ‘shutter open’ lamp is extinguished, indicating the shutter is closed , it is faulty and the researcher loads his samples with the...
  27. cnh1995

    Synchronous machine problem (not homework)

    < Mentor Note -- thread moved to HH from the technical forums, so no HH Template is shown > Here's a question from a national-level engineering exam in India called GATE (2017). It is for 2 marks, numerical answer type. Two synchronous motors A and B in parallel with identical O.C...
  28. A

    Acetylsalicylic Acid Titration Lab: Calculating Mass and Moles of Aspirin

    Really struggling with this! Here is the data: Concentration of NaOH: .104M Mass of Aspirin #1: .367g Mass of Aspirin #2: .365g Volume of NaOH mixed with Tablet 1: 50ml Volume of NaOH mixed with Tablet 2: 50 ml Trial 1 Mass of Na2CO3: .065g Initial volume of HCl: 18.80mL Final Volume...
  29. prakhargupta3301

    Will there be a difference between the readings of V1 and V2

    I= Current flowing V1= Voltmeter 1 V2= Voltmeter 2 My question is that if there would be any difference between the readings of V1 and V2? We know that: By Ohm's law: V= I.R also: Combined resistance of R1 and R2 will be: 1/RCombined Resistance of R1 and R2= 1/R1+1/R2 The reading in V2...
  30. B

    Help (: adding vectors components.... angles, drawing.

    Homework Statement A ship traveling 55 degrees [W of N] is 65km farther north after 3.0h. What is the ship's velocity. Homework Equations sin, cos, tan? The Attempt at a Solution I know that Vground= Vair + Vwind, and that Vground = Vboat + Vcurrent, but I'm not sure if that is even relevant...
  31. H

    How to find added thermal heat in monoatomic gas?

    Homework Statement for number 3,4,5 I'm still tryingHomework Equations PV/T = PV/T q = ΔU + W W = P ΔV The Attempt at a Solution (3) I used PV/T = PV/T to find the ΔT for each process for A→B I find PV/TA = P3V/TB ----- TB = 3TA (T increase) for B→C I find P3V/TB = 4P3V/TC ----- TC =...
  32. V

    Can anyone me with this division and remainder problem?

    Is there any chance someone can help me solve this? Music teacher with absolutely no idea how to solve this. Thanl you so much. ? w!81 = 26r3 (the goal is to find the first number, and explain how you figured it out)
  33. P

    Engine Efficiency: Find ΔW & ΔQh

    Homework Statement An ideal gas with Cv = 5 2R, and γ = 1.4 starts at a volume of 1.5m3 , a pressure of 2.0×105Pa ,and a temperature of 300K. It undergoes an isobaric expansion until the volume is V , then undergoes an adiabatic expansion until the volume is 6.0m3 , and finally undergoes an...
  34. P

    Ideal Gas Law -- Isobaric Epansion followed by....

    Homework Statement An ideal gas with Cv = 5/2R, and γ = 1.4 starts at a volume of 1.5m3 , a pressure of 2.0×105Pa, and a temperature of 300K. It undergoes an isobaric expansion until the volume is V , then undergoes an adiabatic expansion until the volume is 6.0m3 , and finally undergoes an...
  35. P

    Carnot Cycle: Analysis of Energy Exchange

    A refrigerator operates on a Carnot cycle. In this cycles, it absorbs 120 J of energy at a temperature Tc while 300 J of work is done on the gas undergoing the cycle. How much energy is exhausted as heat during this process? The answer is 420 J. I am unsure of where to start for this...
  36. P

    How much energy does a bar of iron radiate after losing 8.0 × 10^6J?

    A bar of iron is 0.5m long, 0.2m wide and 0.1m high (which means its volume is 1.0 × 10−2m3 and its surface area is 3.4 × 10−1m2 ). Iron has a density of 7900 kg m3 , a heat capacity of 400 J kg◦C , and a coefficient of linear expansion of 1.2 × 10−5 . The bar of iron is initially at 600K...
  37. S

    Coulomb's Law in 3D: Find Electric Force & Field

    Homework Statement q1= 5 x 10^-6C position (1;2,-1) q2= -3 x 10^-6 C position (-2,1,3) a) what is the electric force caused by q2 on q1? (vector notation) b) what is the electric field at (0,0,0) Homework Equations F = kq1q2/r^2 E= F/q The Attempt at a Solution I really don't...
  38. B

    Solving Homework Equations for x & y with 2x + 3y + 1 = 0

    Homework Statement ##(2x + 3y + 1)dx + (4x + 6y + 1) dy = 0## ##y(-2) = 2## Homework EquationsThe Attempt at a Solution Let ##z = 2x + 3y## then ##z^\prime = 2 + 3y^prime## ##\displaystyle \dfrac{(z + 1)}{2z + 1} + \dfrac13\left({dz \over dx} - 2\right) = 0## ##\dfrac{dz}{dx} = \dfrac{z-...
  39. D

    Which code segment completes this C code?

    Homework Statement This is a question from the test i had today in which we had to look at certain C code segments and deduce which code part is missing in order for the program to do what we desire. Part b) was a short questionnaire to test our knowledge about c types and declarations. Part a)...
  40. Alkozy

    How Can I Understand the Solution for Diodes Homework in Electronics?

    Homework Statement A picture of the problem is provided in the attachment Homework Equations there is no special relations except I= Is x e^(vd/Vt) The Attempt at a Solution i have a solution for from the solution manual but i do not understand it like the I2 equation i don't get reasonable...
  41. Alkozy

    Two-Stage BJT Amplifier Homework: Solving for Input Resistance and Voltage Gain

    Homework Statement see pic in the attachment beta = 100 Homework Equations Rinput=Rth Vinput=VTH iB= ic/beta IE=ic /alpha iB=iE/(beta+1) gm=IC/VT Avo=-gmRC Av=-gm(RC||RL) Gv=-Beta[(RC||RL)/Rsig+(beta+1)re re=alpha/gm The Attempt at a Solution solving each stage separately. First DC analysis...
  42. I

    MHB I can never get started on my Math homework.

    I can never get started on, or never get motivated with my math homework. I know this seems like a stupid question, but if anyone has any tips, they would be helpful. Thanks!
  43. D

    Assistance needed writing a C program

    Homework Statement My task is to write a program that reads from the .txt file into a list which contains two parts, the part of the text from the file and a pointer to the next element. Here are the specifications of the problem: When reading from the file you should separate the letters from...
  44. S

    Solving a Homework Problem with Mass, String, and Friction

    Homework Statement There's two blocks of mass m_{A} and m_{B} which are linked by an ideal string. The block of mass A descends at constant speed. There's no friction. If the pulley is ideal, which one of the following is true[/B] Homework Equations Newton laws and trigonometry I...
  45. E

    How Does LIGO Detect Gravitational Waves Using Laser Interferometry?

    Homework Statement In-phase light from a laser with an effective power of 2x105J and a wavelength of 1064nm is sent down perpendicular 4km arms of the LIGO detector. (i) Determine the number of photons traveling in the interferometer arms. (ii) Assuming the detector is sensitive enough to...
  46. Y

    Help in Homework - Kinetic Energy

    Homework Statement Problem: http://imgur.com/a/Sw2zA Hi all, I was given this problem as homework and I have almost no clue on how to solve it. I have tried for some time with no luck. Homework Equations We learned about kinetic and potential energy as well as work. W = F*d W = delta KE PE =...
  47. G

    Stuck on projectile motion problem using gravitational force

    Homework Statement A projectile is fired vertically from the Earth's surface with an initial speed of 11.4 km/s. Neglecting air drag, how far (in meters) above the surface of the Earth will it go? Homework Equations (1/2)mv^2 -GmM/R The Attempt at a Solution KEi+PEi = KEf+PEf (1/2)mv^2 -...
  48. herbertpbarreto

    Chemical Reaction Engineering homework

    Homework Statement The decomposition of phosphine 4PH3(g) + P4(g) + 6H2(g) is first-order with respect to phosphine with a rate constant k = 0.0155 s-l at 953 K. If the decomposition occurs in a constant-volume batch reactor at 953 K, calculate, for 40% conversion of PH3, (a) the time...
  49. W

    Electrophysiology Quick Homework Problems

    Homework Statement Hi guys, I've been trying to solve these two questions for the last hour and can't seem to find the solution, any help would be very much appreciated. :smile: 1. An RC circuit is given a step voltage (charging) of V at t = 0 seconds. What is the value of voltage at t = 2RC...
  50. generalguiness

    Static friction force homework

    Homework Statement A 50kg object begins at rest on a surface with a static coef of friction at 0.6. If you push horizontally on the object with a force of 27N, how quickly will it move across the surface? Homework Equations The Attempt at a Solution[/B] This is from Trivium Praxis test prep...
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