Homework problem Definition and 419 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. majormuss

    How Much Energy Is Released in Tritium Nucleus Formation?

    Homework Statement A tritium nucleus is formed by combining two neutrons and a proton. The mass of this nucleus is 9.106 × 10–3 universal mass unit less than the combined mass of the particles from which it is formed. Approximately how much energy is released when this nucleus is formed...
  2. Z

    Need Help Solving Physics Homework Problem

    hi, the question is in the image attached. i just don't get the correct answer. what i did was count the total torque in respect to the pivot and equal it to i*alfa. maybe i am getting the signs and direction wrong or maybe i am misplacing the masses. can some one please write the equation...
  3. matt_crouch

    Is Lambda = 1 an Eigenvalue of the Given Matrix?

    Homework Statement Show that lambda = 1 is an eigenvalue of the matrix 2,-1, 6 3,-3, 27 1,-1, 7 and find the eigenvalues and the corresponding eigenvectors Homework Equations The Attempt at a Solution I don't understand how to actually get eigenvalues and...
  4. M

    What Is the Vertical Acceleration at the Lowest Point of a Swinging Pendulum?

    original pendulum of mass 11 kg with a period of 1.6 sec, displaced an angle of 12 degrees from the vertical. What would its acceleration be in the vertical (y) direction as it reachs the lowest point on its swing? wouldn't it just be -9.8? (since its just the force of gravity acting on it)
  5. M

    Calculating Acceleration on an Inclined Plane

    Homework Statement A 3.86 kg block slides down a smooth, fric- tionless plane having an inclination of 28◦ . The acceleration of gravity is 9.8 m/s2 . Find the acceleration of the block. Answer in units of m/s2. Homework Equations idk what equation to use? The Attempt at a...
  6. J

    What Will the Concentration of Uranium 235 Be in One Billion Years?

    Homework Statement At present, the concentration of uranium 235 in naturally occurring uranium deposits is approximately 0.77%. What will the concentration be one billion years from now? Homework Equations N(t) = No e^ -(ln(2)/half-life)t The Attempt at a Solution i attempted...
  7. C

    How Does Tripling a Filament's Diameter Affect Current Flow?

    Homework Statement A light bulb has a straight metal wire filament of 50 micro metres diameter and 10mm long and when powered with a 5V constant voltage supply it draws 0.5A of current. What happens to the current if the filament is replaced with one of three times the diameter? Homework...
  8. N

    Is there always a potential for conservative motion?

    Homework Statement It is well known that for a conservative motion there is a potential. This potential is a function of coordinates only. Prove this. Homework Equations The Attempt at a Solution I think you have to take a definition of conservative motion then for example...
  9. C

    Inelastic Collision homework problem

    Homework Statement Two 75.0 kg hockey players skating at 6.15 m/s collide and stick together. If the angle between their initial directions was 130°, what is their speed after the collision? (Let the motion of player 1 be in the positive x-direction and the motion of player 2 be at an angle of...
  10. M

    Homework Problem regarding speed of hydrogen molecule

    Homework Statement You place 83 moles of hydrogen gas in a balloon of volume 2.8 m3, and find the pressure to be 1.4 times atmospheric pressure. What is the typical speed of a hydrogen molecule? Homework Equations v=(sqrt)((3*Boltzmann Constant*T)/mhydrogen T=pv/nr The Attempt...
  11. W

    Conductivity homework problem help

    Homework Statement At what temperature does a carbon resistor have a resistance of 995 ohms, if it has a resistance of 1000 ohms at 20 degrees? What is its conductivity at the new temperature? Homework Equations The Attempt at a Solution I don't even know where to start.
  12. D

    Angular acceleration homework problem

    Homework Statement What is the tangential acceleration of a bug on the rim of a 8.0 in. diameter disk if the disk moves from rest to an angular speed of 75 revolutions per minute in 5.0 s? (b) When the disk is at its final speed, what is the tangential velocity of the bug? (c) One second...
  13. D

    Angular motion homework problem

    Homework Statement An electric motor rotating a workshop grinding wheel at a rate of 90 rev/min is switched off. Assume constant negative angular acceleration of magnitude 2.50 rad/s2. (a) How long does it take for the grinding wheel to stop? (b) Through how many radians has the wheel...
  14. I

    Solving a Robot Probe Homework Problem on Mars

    Homework Statement a robot probe drops a camara off the rim of a 239 m high cliff on mars, where the freefall acceleration is -3.7 m/s^2. a. fiind the velocity wl which the camara hits the ground. b. find the tiime required for it to hit the ground. Homework Equations vf^2= vi^2+2ad...
  15. N

    Statics Homework problem - Reactions of Ball and Socket

    Homework Statement The pipe assembly shown in the picture supports the vertical loads shown. Determine the reactions at the ball and socket joint (point A) and the tension in the two cords BC and BD. Homework Equations Sum of Forces = 0 Sum of Moments = 0The Attempt at a Solution I first...
  16. S

    Prime Factorization Homework Problem 3

    Homework Statement In one part of a musical composition, the triangle player in an orchestra plays once every 12 beats. The tympani player plays once every 42 beats. How often do they play together? Homework Equations don't have any The Attempt at a Solution Insufficient...
  17. S

    Prime Factorization Homework Problem 2

    Homework Statement Presidential elections are held every four years. Senators are elected every 6 years. If a senator was elected in the presidential election year of 2000, in what year would he or she campaign again during a presidential election year? Homework Equations dont know...
  18. S

    Prime Factorization Homework Problem 1

    Homework Statement Margo has piano lessons every two weeks. Her brother Roberto has a soccer tournament every three weeks. Her sister Randa has an orthodontist appointment every four weeks. If they all have activities this Friday, how long will it be before all of their activities fall on...
  19. D

    Adiabatic Wind Descending Homework Problem

    Hi everybody, this is my first post on your forum and i hope someone can help me :) the problem is i can figure out how to approuch this problem :s i do know that the process of the air descending is adiabatic but still i can't get it :( thanks for your help guys in advance. Homework...
  20. L

    Proving Continuity of f: [0,1) to S^1

    how do i show that f: [0,1) \rightarrow S^1; t \rightarrow (\cos{2 \pi t}, \sin{2 \pi t}) is a continuous bijection but not a homeomorphism. so i know i have to (i) show f is a continuous bijection (ii) show f^{-1} is not continuous so for (i), surjectivity: if i take a point (a,b)...
  21. U

    Momentum Eqn. Homework Problem:

    I posted this in the advanced forum by mistake so I'm am posting it here as I think it may be more appropriate in this forum. Homework Statement A motor boat is speeding at velocity W0 when the motor is turned off and a scoop is lowered into a still lake. The scoop captures flow with a cross...
  22. F

    Solving the Derivative of f(a): A Frustrating Homework Problem

    Homework Statement For some reason, I cannot seem to get the derivative for this. Homework Equations f(a) =\frac {(2500+0.2t)(1+t)}{\sqrt {0.5t+2}} The Attempt at a Solution f(a) =\frac {(2500+0.2t)(1+t)}{\sqrt {0.5t+2}} \frac {(2500+0.2t)}{\sqrt {0.5t+2}} (1+t) From...
  23. F

    Thermodynamic Homework Problem Check

    Can you check over my answers to see if my reasoning is correct? Homework Statement #3) "Yesterday I woke up and it was 20°F in my bedroom," said Mert to his old friend Mort. "That's nothing," replied Mort. "My room was -5.0°C." Who had the colder room, Mert or Mort? Homework Equations...
  24. V

    Solving a Lightning Storm Homework Problem

    Homework Statement A certain storm cloud has a potential of 1.50 x 10^8 V relative to a tree. If, during a lightning storm, 50.0 C of charge is transferred through this potential difference and 1.00% of the energy is absorbed by the tree, how much sap in the tree can be boiled away? Model...
  25. H

    How High Does a Rocket Go if It Accelerates at 79.0 m/s² for 1.90 Seconds?

    Homework Statement A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 79.0 m/s2 for 1.90 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground)...
  26. D

    Countability of Algebraic Numbers as Roots of Polynomials

    Homework Statement A real number x \in R is called algebraic if there exist integers a_{0},a_{1},a_{2}...,a_{n}, not all zero, such that a_{n}x^{n} + a_{n}_{1}x^{n-1} + ... + a_{1}x + a_{0} = 0 Said another way, a real number is algebraic if it is the root of a polynomial with integer...
  27. J

    Can a Critical Angle Occur When Light Passes from Water to Glass?

    Is it possible for the critical angle to exist when light goes from water (n=1.33) into glass (n=1.5)? My used the formula sin(critical angle) = n1/n2. I'm a bit confused, should the numerator(n1) always be less dense compared to the denominator(n2).
  28. 1

    Cheetah Acceleration: Solving Homework Problem in 3.2s

    A cheetah is hunting. Its prey runs for 3.2 s at a constant velocity of +10.0 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time?
  29. L

    Car's Final Velocity and Distance Traveled in Braking Period

    A car starts from rest and travels for 5.9 s with a uniform acceleration of +1.3 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.1 m/s2. The breaks are applied for 1.60 s. (a) How fast is the car going at the end of the braking period? (b) How far has the car...
  30. B

    What Speed Should Jane Walk to Match John's Arrival Time?

    Homework Statement John walks 1.60 north, then turns right and walks 1.40 east. His speed is 1.80 during the entire stroll. If Jane starts at the same time and place as John, but walks in a straight line to the endpoint of John's stroll, at what speed should she walk if she wants to...
  31. P

    Homework problem (tangents equation)

    Could you help me solve this one : Write the the equations of the tangents of the parabole x^2=2y-4 that go through the origin of coordinates. Whats the surface of the figure formed by the parabole and the tangents. I am not sure i have translated thi one in an understanding way :(.
  32. N

    Does Body A Exert a Negative Impulse on Body B in a Closed System?

    If body A exerts an impulse of say +2Ns on B, then does body A exert an impulse of -2Ns on B providing no external forces act? Thanks
  33. S

    How Does Photon Wavelength Affect Electron Ejection and Metal Work Function?

    Homework Statement A photon of wavelength 250 nm ejects an electron from a metal. The ejected electron has a de Broglie wavelength of 0.85 nm. (a) Calculate the kinetic energy of the electron. (b) Assuming that the kinetic energy found in (a) is the maximum kinetic energy that it could...
  34. E

    Velocity, Speed, Acceleration, and CAPA homework problem - I'm stumped

    Homework Statement "A car travels a certain distance along a straight road and on the way must stop at traffic lights and obey local speed limits. The figure (not pictured but info filled in below) shows the distance the car travels as a function of time. Choose all the correct answers which...
  35. S

    How Do You Solve for x in a Midpoint Geometry Problem?

    Homework Statement Point M is the midpoint of RT ( with the lin on top of RT).RM = x and RT = 4x-6. Find the value of x. Homework Equations The Attempt at a Solution I wrote out the equation (RT=4x-6)/2=RM but I am not sure if this is the right approach.
  36. L

    Convergence Test for Series with Square Root Terms

    Homework Statement Using Comparison test and LCT, determine whether it is convergent or divergent: (summation n=1 to infinity) sqrt(n+2)/(2n^2+n+1) Homework Equations The Attempt at a Solution i compared it with sqrt(x)/2n^2 which is 1/2n^(3/2) and then the answer showed...
  37. J

    I'm having trouble with this homework problem Current & Magnetic Field

    I'm having trouble with this homework problem! Current & Magnetic Field! This problem deals with current and the magnetic fields around these 2 parallel wires. The question is listed below, as is the link to the picture. Thanks SO Much for your help...
  38. R

    OMG i like have the worst homework problem ever111;(

    Ok, so like i am in this very complicated philosophie of math course with like a little science fiction writing on the side for extra credit, so since the class is like a joke cause i mean it is philosophy after all and not maths (rock on math! why is it that math seems to be useful in...
  39. L

    Homework problem: Average speed and time

    Homework Statement A golfer rides in a golf cart at a speed of 3.10 m/s for 24.0 s. She then gets out of the cart and starts walking at an average speed of 1.30 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 1.90 m/s...
  40. N

    Homework problem on rotational speed

    what is the rotational speed of the hand on a clock that measures the minutes? what is the rotational speed of the hand on a clock that measures the seconds?
  41. J

    Physics Homework problem: Dielectrics

    I cannot figure out this problem...can someone help me? A 3500 air-gap capacitor is connected to a 32 battery. If a piece of mica fills the space between the plates, how much charge will flow from the battery? Express your answer using two significant figures.
  42. R

    How to Approach a Complex Statics Homework Challenge?

    Any assistance given is greatly appreciated. Thanks in advance. http://img3.imageshack.us/img3/5519/hw3statics.jpg Thanks again.
  43. Ƒ

    Bonus Homework Problem: Integral of csc

    \int csc dx = ? [b]I just am seeking confirmation as to whether or not I did this correctly. I apologize beforehand for any formatting errors. \int csc(x) dx = \int 1/sin(x) dx u = sin(x) du = cos(x)dx du / cos(x) = dx u2 = sin2(x) u2 = 1 - cos2(x) \sqrt{}{u^2-1} = cos(x) du...
  44. J

    Solving for Initial Velocity Up a Plane: A Homework Problem

    Homework Statement A carton is given an initial speed of 3.0 m/s up a 22.0 degree plane. a.) How far up the plane will it go? b.) How much time elapses before it returns to its starting point? Ignore friction. Homework Equations F=ma The Attempt at a Solution I have no clue. If...
  45. J

    Bournalli's Equation homework problem

    A fluid of density (rho) flows through a horizontal pipe with negligible viscosity. The flow is streamline with constant flow rate. The diameter of the pipe at Point 1 is d and the flow speed is v. If the diameter of the pipe at Point 2 is d/3, then the pressure at Point 2 is...
  46. T

    Homework Problem Involving Forces, Torque, and Moment of Inertia

    Homework Statement The combination of an applied force and a friction force produces a constant total torque of 36.0 N·m on a wheel rotating about a fixed axis. The applied force acts for 6.00 s. During this time the angular speed of the wheel increases from 0 to 10.0 rad/s. The applied force...
  47. C

    Oscilloscope trigger homework problem

    http://img502.imageshack.us/img502/8941/webworks4ez6.jpg" . The first answer is 2.5V, but I'm having trouble getting ωt I'm using the equation: V = V0 sin(ωt) --> 2.5V = 5V sin(ωt) --> sin-1(2.5V/5V) = ωt --> ωt = 30 degrees but that's incorrect and so is -30 degrees I've just used an...
  48. K

    Calculating the Period of Mars in Earth Years Using Gravitational Equations

    Homework Statement Distance of Earth from Sun = 1.50 x 10^11m Period = 365.2 days Distance of Mars from Sun = 2.28 x 10^11km Period of Mars in Earth Years? Homework Equations (Ta/Tb)^2 = (Ra/Rb)^3 The Attempt at a Solution (365.2 days/Tm)^2 =(1.50 x 10^11m/2.28x10^14m)^3...
  49. F

    What is the Maximum Acceleration for Contact of Skidding Bicycle Tires?

    Homework Statement A simplified model of a bicycle of mass M has two tires that each comes into contact with the ground at a point. The wheelbase of this bicycle (the distance between the points of contact with the ground) is w, and the center of mass of the bicycle is located midway between...
  50. L

    Does this physics homework problem make sense?

    Homework Statement A 0.85kg mass oscillating on a spring w/ spring constant of 45 N/m. How do i determine angular frequency? A 0.85kg mass oscillating on a spring w/ spring constant of 45 N/m. This object reaches a maximum position of 12 cm from equilibrium. Determine: a.) angular frequency...
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